Coupled Human and Natural Cube: A novel framework for analyzing the multiple interactions between humans and nature

LIU Haimeng, FANG Chuanglin, FANG Kai

Journal of Geographical Sciences ›› 2020, Vol. 30 ›› Issue (3) : 355-377.

PDF(4623 KB)
PDF(4623 KB)
Journal of Geographical Sciences ›› 2020, Vol. 30 ›› Issue (3) : 355-377. DOI: 10.1007/s11442-020-1732-9
Research Articles

Coupled Human and Natural Cube: A novel framework for analyzing the multiple interactions between humans and nature

Author information +
History +

Abstract

Understanding the interactions between humans and nature in the Anthropocene is central to the quest for both human wellbeing and global sustainability. However, the time-space compression, long range interactions, and reconstruction of socio-economic structures at the global scale all pose great challenges to the traditional analytical frameworks of human-nature systems. In this paper, we extend the connotation of coupled human and natural systems (CHANS) and their four dimensions—space, time, appearance, and organization, and propose a novel framework: “Coupled Human and Natural Cube” (CHNC) to explain the coupling mechanism between humans and the natural environment. Our proposition is inspired by theories based on the human-earth areal system, telecoupling framework, planetary urbanization, and perspectives from complexity science. We systematically introduce the concept, connotation, evolution rules, and analytical dimensions of the CHNC. Notably there exist various “coupling lines” in the CHNC, connecting different systems and elements at multiple scales and forming a large, nested, interconnected, organic system. The rotation of the CHNC represents spatiotemporal nonlinear fluctuations in CHANS in different regions. As a system continually exchanges energy with the environment, a critical phase transition occurs when fluctuations reach a certain threshold, leading to emergent behavior of the system. The CHNC has four dimensions—pericoupling and telecoupling, syncoupling and lagcoupling, apparent coupling and hidden coupling, and intra-organization coupling and inter-organizational coupling. We mainly focus on the theoretical connotation, research methods, and typical cases of telecoupling, lagcoupling, hidden coupling, and inter-organizational coupling, and put forward a human-nature coupling matrix to integrate multiple dimensions. In summary, the CHNC provides a more comprehensive and systematic research paradigm for understanding the evolution and coupling mechanism of the human-nature system, which expands the analytical dimension of CHANS. The CHNC also provides a theoretical support for formulating regional, sustainable development policies for human wellbeing.

Key words

Coupled Human and Natural Cube / human-environment systems / social-ecological systems / pericoupling and telecoupling / climate change / urbanization / human activity / complexity science / sustainability science

Cite this article

Download Citations
LIU Haimeng, FANG Chuanglin, FANG Kai. Coupled Human and Natural Cube: A novel framework for analyzing the multiple interactions between humans and nature[J]. Journal of Geographical Sciences, 2020, 30(3): 355-377 https://doi.org/10.1007/s11442-020-1732-9

1 Introduction

Since the 20th century, interactions between humans and nature have become unprecedentedly intensified. The acceleration of industrialization, urbanization and informatization have led to increasingly serious environmental problems, including shortages of clean water, degradation of ecosystems, increased soil erosion, loss of biodiversity, air pollution, declining fisheries yields, global climate change, and more; the earth has entered the Anthropocene (Bai et al., 2016; Goudie, 2013; Malhi, 2017; Steffen et al., 2016). Understanding human-nature interaction is central to the quest for both human wellbeing and global sustainability. Coordinated development between humans and nature is the basis for achieving the UN 2030 sustainable development goals (Fu, 2019). Therefore, this issue has become the core content of many disciplines, including geography, ecology, environmental science, earth system science, and sustainability science (Alberti, 2008; Glaser et al., 2012; Wu et al., 2014; Nagendra et al., 2018). In recent years, many global research initiatives and projects have been devoted to exploring the coupling mechanism between humans and nature in the process of urbanization and economic development. These initiatives and projects include Future Earth, Intergovernmental Panel on Climate Change (IPCC), Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES), The Economics of Ecosystems and Biodiversity (TEEB), Resilience Alliance (Holling, 2001), and the International Network of Research on Coupled Human and Natural Systems (CHANS). In line with these, the International Geographical Union has set up a commission on Geography for Future Earth: Coupled Human-Earth Systems for Sustainability (IGU-GFE), and the international cooperation funding for Towards a Sustainable Earth: Human and Environment Interaction and Sustainable Development (TaSE) has been jointly established by several countries.
The interactive coupling between humans and nature is a large, open and complex system involving society, economy, culture, and nature, which contains complex coupling mechanisms. To understand the interactions, geographers, ecologists, economists, environmental scientists and other scholars from different disciplines have put forward many research theories and frameworks, including principally: Human-earth Areal System (Wu, 1991), Social-Economic-Natural Complex Ecosystem (Wang et al., 2011), Coupled Human and Natural Systems (Liu et al., 2007b), Social-ecological Systems (SESs) (Ostrom, 2009), Human-earth Coupling Loop (Fang et al., 2016b), Footprint Family (Fang et al., 2014), Planetary Boundaries (Steffen et al., 2015), Telecoupling Framework (Liu et al., 2013), Water-Energy-Food Nexus (Liu et al., 2018b), DPSIR Framework (Tscherning et al., 2012), STIRPAT Framework (York et al., 2003), Emergy Analysis (Hau and Bakshi, 2004), Sustainable Livelihoods Framework (Sherbinin et al., 2008), Population-Development-Environment Model (PDE) (Dietz, 2017; Hummel et al., 2013). Moreover, Gunderson and Holling (2001) proposed the famous adaptive cycles model to analyze ecosystems and social-ecological systems across scales; Dietz et al. (2003) elaborated the strategies and general principles for adaptive governance of environmental resources; Folke (2006) discussed the resilience perspective for social-ecological systems analysis; Liu (2017) further proposed a metacoupling framework based on telecoupling.
Through a literature review, we found that the traditional study of the human-nature interaction framework tended to focus on a particular areal system in the spatial dimension, the study of the synchronization of system evolution in the time dimension, and on the linear or direct causal relationships. However, due to socioeconomic transformation, improvements in rapid transportation systems, economic globalization, and the information and intelligence revolution, new phenomena at the global scale, such as time-space compression, long range interactions, and social organization reconstruction, have exerted a profound influence on human and natural systems (Liu et al., 2017a; Wang et al., 2018; Warf, 2008). New coupling issues between humans and nature increasingly appear, such as remote influence, dislocation or lag feedback in time, indirectness and concealment of driving forces, and diversity of agents. Thus, traditional research frameworks are unable to cope with complex coupling in the new era, and current theories and paradigms are in urgent need of adaptive innovation and reform.
Based on previous theoretical research, this paper first analyzes the scientific connotation of CHANS. Inspired by theories based on the human-earth areal system, telecoupling framework, planetary urbanization, and perspectives from complexity science (Batty, 2013; Li et al., 2017a), from the four dimensions of space, time, representation, and organization, we create a research framework to explain the coupling mechanism between humans and nature: the “Coupled Human and Natural Cube” (CHNC). Additionally, we propose the concepts of lagcoupling, hidden coupling, and inter-organizational coupling within the CHNC. This framework is expected to promote the development of human-earth system theory in the new era, provide theoretical support for multi-dimensional interaction analysis between humans and nature in the Anthropocene, and to help formulate regional sustainability policy.

2 Concept of coupled human and natural systems

Human activity on earth’s surface includes a series of complex evolutionary and transformational processes, such as farming, fishing, grazing, trading, urbanization, expansion of residential land, population migration, industrial agglomeration, energy and mineral consumption, and engineering construction (Steffen et al., 2006). Nature is the basis for human survival and reproduction, comprising many elements, such as water, soil, gas, biology, energy, and minerals. It is the sum total of various environmental factors and ecological relations that living organisms rely on for survival, development, reproduction, and evolution (Daily, 1997). Many scholars analyze the interactions between human systems and natural systems using different appellations, including human and natural systems (Liu et al., 2007b), human-environment systems (Turner et al., 2003), human-earth systems (Chapin et al., 2011), social-ecological systems (Ostrom, 2009), ecological-economic systems (Costanza et al., 1993), or population-environment systems. We use “human and natural systems” in this paper, and we analyze multiple interactions between the two systems. Coupling, with a profound connotation, is generally used to explain the complex mutual dependence, interaction, influence, and adaptation processes between humans and nature (Morzillo et al., 2014; Qi et al., 2012). These couplings include positive and negative effects: As a result of population growth, economic development, energy consumption, technological progress, urban management, and expansion of human settlements, human activity has had a coercive or promotional effect on eco-environment systems (Alberti, 2015); in turn, nature exerts constraining or bearing force on human development through resource carrying, ecosystem service, environmental fairness, and policy intervention (Boumans et al., 2015; Cui et al., 2019). Thus, the two systems have a dialectic relationship of coopetition and the unity of opposites.
To better understand coupled human and natural systems visually, we use a conceptual illustration as in Figure 1. Humans and nature are two large, complex, open systems, similar to two buildings. The human system includes subsystems of population, economy, society, and information, while the natural system includes subsystems of water, land, atmosphere, biodiversity, and energy. There are many elements inside each subsystem, some of which are key (called order parameters in Synergetics) and some of which are general. Key elements are represented by the large dots in Figure 1, while small dots represent general elements. In Figure 1, the elements inside a subsystem interact with each other through horizontal lines, and the subsystems interact and connect with each other through vertical lines. There are more lines with interactive coupling effects between human and natural systems. In this paper, these complex lines are collectively referred to as “coupling lines” and represent the positive and negative feedback effects between systems and elements, among which there are promotion and restriction, opposition and unity. The coupling mechanism behind each coupling line is different, and so too is the coupling strength. These complex interactive coupling forces exert influences on the whole CHANS in spatial and temporal dynamic evolution. Self-organization of the underlying elements and the emergence of the system as a whole occur at the same time, resulting in fluctuations of the whole system, which jointly determine the evolutionary direction of the whole coupling system.
Figure 1 Conceptual illustration of coupled human and natural systems

Full size|PPT slide

Overall, the two subsystems in the CHANS not only have their own evolutionary rules and restriction factors but also form a complex large coupling system of mutual connection, support, and restriction through continuous material circulation, energy flow, and information transmission. The evolution of coupling system is a self-organizing fluctuation process from a chaotic to an ordered state within a certain range of time and space, through interaction with the external environment and subsystems (Bak, 2013). The pattern and process of this evolution are multi-layered and interrelated, and there are multiple coupling and feedback mechanisms between processes; moreover, the scales of action of different processes are different (Mchale et al., 2015; Werner and Mcnamara, 2007). According to complexity theory, the CHANS have the characteristics of opening, self-organization, fluctuating, nonlinearity, vulnerability, robustness, feedback, fluctuation, phase change, multiple feedback, and scale nesting (Liu et al., 2007b; Liu et al., 2016a).

3 Theoretical foundation and connotation of CHNC

3.1 Theoretical foundation

The CHNC framework in this paper builds on a long tradition of scholarship on human-nature interactions. Furthermore, it is an innovative development of existing relevant theories, mainly drawing inspiration from the theories of the human-earth areal system, telecoupling, and planetary urbanization.
3.1.1 Human-earth areal system
Wu (1991) proposed that the human-earth areal system is a dissipative unstable structure, nonlinear, and far from an equilibrium state. He believed that researching human-earth interactions must pay attention to the relationship between time and space changes, specifically considering spatial scale, location, and time attributes: the past, present, and future. Our research objective is to explore the interactions between various elements in a system and its overall behavior, and to elucidate the optimization, comprehensive balance, and effective regulation mechanisms of the human-earth areal system at different scales, from the perspectives of spatial structure, time processes, organizational change, overall effect, coordination, and complementarity. People interact with resources and environment using intermediate products, the most basic being food. Input-output is the most basic two-way process in the human-earth areal system. Based on Wu’s theory, other scholars have made progress in human-earth system structure, human-earth coupling theory, human-earth system evolution, human-water areal systems, and other aspects (Fan et al., 2017; Li et al., 2017b; Fang, 2006; Liu et al., 2014a).
3.1.2 Telecoupling
Interactions between distant places are increasingly widespread and influential. Liu et al. (2007a) proposed that CHANS exhibit nonlinear dynamics with thresholds, reciprocal feedback loops, time lags, resilience, heterogeneity, and surprises. Furthermore, past couplings have legacy effects on present conditions and future possibilities. The implications of telecoupling were then discussed as an umbrella concept that refers to socioeconomic and environmental interactions over distances, and the international research network of CHANS was created (Liu et al., 2013). The telecoupling framework contains five major interrelated components, i.e., coupled human and natural systems, flows, agents, causes, and effects. Population migration, tourism, trade, species diffusion, technology transfer, and investment are important telecoupling processes (Liu et al., 2013; Liu et al., 2015). In recent years, using this theoretical framework, scholars have conducted extensive discussions on land use change (Liu et al., 2014b), water resource management and virtual water (Deines et al., 2016), ecosystem services (Liu et al., 2016b), energy (Fang et al., 2016a), fishery management (Carlson et al., 2017), the Belt and Road Initiative (Yang et al., 2016), and other fields.
3.1.3 Planetary urbanization
Planetary urbanization theory was proposed in 2011 (Brenner and Schmid, 2011), globally arousing scholars’ attention (Buckley and Strauss, 2016). The theory highlights that the city is not a closed unit, but a process of change, and the traditional boundaries between urban and rural areas tend to be blurred. Urbanization is a global, multi-scale historical process that extends to every corner of the earth. Planetary urbanization means that even spaces that lie well beyond the traditional city cores and suburban peripheries—from transoceanic shipping lanes, transcontinental highway networks, and worldwide communications infrastructures, to alpine and coastal tourist enclaves, “nature” parks, offshore financial centers, and even the world’s oceans, deserts, jungles, mountain ranges, and atmosphere—have become integral parts of the worldwide urban fabric (Brenner, 2013; Brenner and Schmid, 2011). Urbanization contains two dialectically intertwined moments—implosion (concentration, agglomeration) and explosion (extension of the urban fabric, intensification of interspatial connectivity across places, territories, and scales). Many places have changed into extended regional urbanization, and the research paradigm should go beyond “urban centrism” and turn to “planetary urbanization” (Brenner and Schmid, 2014).

3.2 The connotation of CHNC

Absorbing the core ideas of the above theories, we expand the four analytical dimensions of space, time, representation and organization of CHANS, as well as deconstructing the complex system based on spatial distance, time span, causal relationship, and organizational connection. The four dimensions constitute a panoramic and dynamic analytical framework to explain the coupling mechanism between humans and nature, and the four dimensions, as a whole, nest with each other, having mutual contact. For understanding and memory, the novel analytical framework is expressed in the form of a Rubik’s cube (CHNC).
As shown in Figure 2, the coupled human-nature system in any particular region can be regarded as a small cube (CHNC-c) in the Rubik’s cube. Zooming in on the little cube, its interior contains numerous eco-environment and socioeconomic elements, represented by small balls of different sizes (1, 2, 3, ..., i). Among them, the larger ones have a much stronger influence on the system (the order parameters) than the smaller ones. Positive and negative feedback effects occur between the balls through the “coupling line.” The system is open: the arrows of inputting and outputting cubes represent the inflow and outflow of people, goods, energy, and information. Each cube represents a coupled human-nature system in a particular region.
Figure 2 The conceptual illustration of Coupled Human and Natural Cube

Full size|PPT slide

Each cube has four interrelated dimensions: time, space, organization, and representation. As shown in Figure 2, the X-axis represents the time dimension, and the axis inside the small cube belongs to the short-term coupling effect between humans and nature, while the axis outside belongs to the long-term coupling effect. The Y-axis represents the organizational dimension, and the axis inside the small cube belongs to the intra-organization coupling effect between humans and nature; the axis outside belongs to the inter-organizational coupling effect. The Z-axis represents the spatial dimension, and the axis inside the small cube belongs to the short-distance coupling effect between humans and nature, while the axis outside belongs to the remote coupling effect. In addition, from the perspective of whether causality is direct, there is not only an explicit interactive coupling between humans and nature but there is also an implicit, indirect interaction that cannot be seen on the surface or through the third party; this effect is called “hidden coupling.” Therefore, there are pericoupling, syncoupling, apparent coupling, and intra-organization coupling between humans and nature inside the cube. On the outside of the cube, there are also four dynamic mechanisms of telecoupling, lagcoupling, hidden coupling, and inter-organizational coupling. These will be discussed in section 4.

3.3 Evolution rules of CHNC

There are many colorful small cubes in the large Rubik’s cube CHNC (Figure 2), each of which represents a particular human-nature system. These small cubes are interrelated and interact with each other through the complex axes and chains inside the Rubik’s cube, which are the “coupling lines” mentioned above. According to the theory of telecoupling and planetary urbanization, there are numerous large or small cubes with different properties on earth, which all have tight or loose relations. The coupling system between humans and nature at the global scale is a super-large Rubik’s cube, while the coupling system at the national or regional scale is a relatively small Rubik’s cube. Certain fractal rules or scale nesting exist among them, as in Figure 3c (Jiang and Ma, 2018). Figure 3 also shows the evolution rules of CHNC. The color of each surface of a small cube represents the subsystem of CHNC, such as water, land, air, economy, population, and energy, and the Rubik’s cube drives itself to rotate through axes and chains; this rotation process involves the collision of different cubes and different colored surfaces. The axes and chains represent the transfer of people, things, and information between different regions, while the rotation of the Rubik’s cube represents the nonlinear coupling effect in space and time of the CNHC between different regions with constant fluctuations of the system.
Figure 3 Evolution and nested-scaling of Coupled Human and Natural Cube

Full size|PPT slide

We propose that when the color of each side of the Rubik’s cube becomes the same, it represents the coordinated development of all subsystems between different regions (but not to the same extent). This process requires work done by an external force, that is, the system is constantly absorbing negative entropy, and when the system reaches a certain threshold, a critical phase transition and emergence occur. Now, a coupled human and natural system at a certain spatial scale achieves coordination and order, and the Rubik’s cube “game” is successful. Internal or external disturbances in the coupled system can be in the form of a sudden event, such as a natural disaster or financial crisis, or in the form of a slow precipitation effect similar to Boiling Frog. Considering the vulnerability and elasticity of the system, along with the input of energy, once the threshold is exceeded, the system will collapse (phase transition) and order will be broken again; the system will then enter a new round of evolution.
However, it is impossible to achieve complete coordination between human and natural subsystems, and regional development will also not be absolutely coordinated, that is, evolution of the Rubik’s cube is difficult to achieve uniform in color for every sides. In reality, the system constantly dynamically fluctuates and is always in an intermediate state between order and disorder, steady state and unsteady state; this is also the general law of evolution of most complex systems in nature (Figure 3). To make the human and natural system as orderly as possible, the order parameters which have the greatest influence on the overall evolution of the system should be selected for regulation. For example, water, reflected by green in the Rubik’s cube in Figure 3, is the order parameter in the arid area; thus, the green side should be adjusted preferentially.

4 Four dimensional framework of CHNC

4.1 Spatial dimension: Pericoupling and telecoupling between humans and nature

From the perspective of the areal space dimension, the coupling between humans and nature can be divided into two categories: pericoupling and telecoupling. Most current research refers to pericoupling, which mainly focuses on the coupling mechanism between subsystems, as well as the elements within a particular areal system. Pericoupling includes different linear and nonlinear coupling mechanisms, and many papers and books have been written in this field (Fang et al., 2016b; Glaser et al., 2012; Marzluff et al., 2008).
Telecoupling refers to the interactions between humans and nature in different remote areal systems, or at different spatial scales. Compared with pericoupling, the telecoupling is lack of systemic research, and its coupling mechanism is more difficult. However, in the last ten years, many scholars have paid considerable attention to this field. Telecoupling is different from teleconnection in simple natural systems (Liu et al., 2013), such as the teleconnections about monsoon rainfall variations over South and East Asia (Kripalani and Kulkarni, 2001). Telecoupling is also different from economic globalization, such as the impact on American employment from the Indian IT services outsourcing industry (Friedman, 2005). Telecoupling for humans and nature in this paper emphasizes the remote bidirectional feedback between the natural and socioeconomic systems, and it includes the impact of the local eco-environment on inhabitants far away, as well as the impact of local human activities on the remote eco-environment. Unlike Liu’s definition, we divide telecoupling into two categories: multi-regional telecoupling (MRTC) and multi-scale telecoupling (MSTC).
4.1.1 Multi-regional telecoupling
MRTC refers to the long-distance interaction and promotion between human and natural systems in different areal systems through various flows, including people, materials, energy, and information. For example, fruit, vegetables, meat, eggs and other foods in big cities come from other small and medium-sized cities, or even other countries. This has a long-distance impact on land use, water security, carbon emissions, and the ecosystem health (Fang and Ren, 2017; Zhao et al., 2015), and even on environments of food importing country (Sun et al., 2018). The energy consumption of heavy industry in Hebei Province in China has a significant impact on air quality in Beijing, even in Korea and Japan (Lee et al., 2013; Liu et al., 2017b). Water diversion has resulted in telecoupling between water supply areas and demand areas in aspects of agriculture, urbanization, and groundwater (Liu and Yang, 2013). Since the Belt and Road Initiative was put forward, the trade volume between China and related countries has increased sharply. China’s rapid economic growth means that more energy and minerals are needed, which will impact the ecological security of exporting countries (Liu et al., 2018a).
4.1.2 Multi-scale telecoupling
MSTC refers to the interaction coupling between human and nature systems at different scales, which can be divided into two paths: top-down and bottom-up (Figure 4). In general, the coupling between systems with similar scales is more frequent and intense, such as that between the urban agglomeration and urban scales. The occurrence rate of coupling between systems with very different scales is relatively small, such as at the national and block scales. In analysis of the multi-scale interaction telecoupling mechanism, attention should be paid to the scale effect of coupling. There are great differences in forms of expression and measurement indicators for humans and nature at different scales. In addition, as shown in Figure 4, urban agglomerations and cities are mesoscale areas between national macro-strategy and micro-implementation subjects (Li, 2016). Regional synergy of industries and regional linkage of environmental governance should be completed at the mesoscale, which is the node of scale transformation and multi-scale coupling, having its own special scale attributes in politics and economy (Brenner, 2000). Generally, top-down multi-scale coupling is more common. For example, the impact of global climate change on local urban development and pollution control is a typical case of global scale affecting local scale (Adachi et al., 2013; Liu et al., 2017b). Bottom-up multi-scale coupling is also widespread, such as the disordered urban expansion in central Inner Mongolia, which will aggravate land desertification and affect the ecological security of the whole of Northeast Asia (Xiao et al., 2017).
Figure 4 Cross-scale telecoupling

Full size|PPT slide

4.2 Time dimension: Syncoupling and lagcoupling between humans and nature

From the time dimension, the coupling between humans and nature can be divided into syncoupling and lagcoupling. Current research mainly focuses on the interaction between humans and nature in similar time sections. In quantitative analysis, it is customary to compare natural and human variables in the same time section, and then to analyze the causal relationship between them. In this paper, an interaction effect occurring in a similar time section is called “syncoupling.” This kind of analytical path has been a classical research paradigm for a long time.
However, because social and economic development have a long dynamic process, and nature has its own evolutionary direction, the development of the two systems is path-dependent. Many forces are time lagged. Sometimes the input of new materials, energy, and information may immediately break the original equilibrium structure; but at other times, due to system resilience, it takes a long time for forces to accumulate before showing themselves to be effective. Therefore, the current state of CHANS may be the result of fluctuations in a subsystem or variable many years ago. Similarly, the current social and economic development of humans may have a lagging impact on the local or larger regional eco-environment in the future (Mcdonald et al., 2008); current natural changes will also affect human survival in the coming years (Zhang et al., 2007). Therefore, we call the interaction and feedback between the human and nature systems in different time periods “lagcoupling,” in which the causal chain has relatively long time intervals.
Figure 5 shows a conceptual map of syncoupling and lagcoupling between humans and nature. The coupling system is represented by a nested Taiji Diagram, which reflects the multi-scale of the CHANS and the interaction between the two subsystems. In the coordinate system, T is the time axis; E(t) entropy value; t1, t2 and t3 the three stable states of the coupled system, which represent the past, present and future of the CHANS, respectively. There are many long-term human-nature interactions between the three time periods. In addition, the system is more stable in t2 than in t1 or t3. When the fluctuations (driven by factors such as human activities, climate change, and natural disasters) are strong enough, the CHANS can cross the barriers (a, b) and tend to a new stable state, generating emergence.
Figure 5 Syncoupling and lagcoupling of human-nature systems

Full size|PPT slide

Lagcoupling is a common phenomenon in nature, and is of great significance for examining the real causal relationship between human activity and environmental change. Because of the irreversibility of time, most lagcoupling phenomenon is the influence of the past on the present or the present on the future. For example, land use change in Asia over the last 200 years has resulted in substantial negative ecological consequences, including increased anthropogenic CO2 emissions, deteriorated air and water quality, alteration of regional climate, an increase in disease, and a reduction in biodiversity (Zhao et al., 2006); Cocoa farming has been a major driver of deforestation in West Africa, contributing to an ever-increasing drying of the climate in a positive feedback cycle-a hotter, drier future climate would likely continue to push cocoa farmers into the wetter southwest of the sub-continent (Ruf et al., 2015); the current upgrading of China’s industrial structure and energy structure will have a positive impact on air quality years later (Fang et al., 2015; Zheng et al., 2015). However, there are also some influences of future events on the current system. For example, at the Paris Climate Conference, China promised to peak carbon emissions around 2030, which has promoted China’s current industrial transformation and green growth (Mi et al., 2017).

4.3 Appearance dimension: Apparent coupling and hidden coupling between humans and nature

From the perspective of appearance, we divide the coupling mechanism between humans and nature into apparent coupling and hidden coupling. Apparent coupling refers to the direct interaction between subsystems, elements within the CHANS. The causal chain is expressed as A→B, and the external forms can be directly perceived. For example, with the advancement of urbanization in developing countries, urban expansion has directly led to the occupancy of woodland and farmland, and the weakening of ecosystem services (Long et al., 2014); the increase in the number of environmental refugees in the last half century has been directly caused by climate change and environmental pollution (Warner, 2010).
Figure 6 A case of hidden telecouplings: Tele-connecting local primary PM2.5 emissions to global consumption

Full size|PPT slide

Moreover, most of the coupling mechanisms between humans and nature involve both apparent and hidden relationships. Like an iceberg in the ocean, such a mechanism consists of two parts: the surface part and the underwater part. Additionally, direct causality at the current cognitive level may well also imply indirect causality due to various mediators. There are also some chain reactions such as A→C→D→…→B, which are similar to the “butterfly effect.” Therefore, apparent coupling and hidden coupling based on the causal chain are unities of opposites.

4.4 Organization dimension: Intra-organizational coupling and inter-organizational coupling between humans and nature

The type of organization discussed in this paper is a group with similar values formed by people’s self-organizing cooperation and competition, in order to achieve certain goals in the process of human development. The values here mainly refer to the trade-off between social economic development and the eco-environment. Governments, NGOs, academics, media, companies, and local community organizations make up different interest groups. Some organizations can also be further subdivided; for example, most governments have departments such as economic development, ecological environment, natural resources, urban construction, water conservancy, energy, and other functional departments, which constitute different political ecologies (Adger et al., 2001; Zimmerer and Bassett, 2003). The cultural, institutional and living environments of each organization are different, leading to different levels of attention and types of decision-making from individuals within different organizations. As a result, different organizations have different values and behaviors, and hence, different coordination mechanisms within the context of the human-nature relationship (Agyeman et al., 2002; Dietz et al., 2003). Organizational behavior will affect the related eco-environment, meanwhile, the eco-environment will in turn affect organizational behavior and human activities.
From the organization dimension, this paper divides the coupling between humans and nature into two categories: intra-organizational coupling and inter-organizational coupling. Intra-organizational coupling refers to the interaction between humans and nature in a particular organization. For example, when dealing with the relationship between economic development and the ecological protection, the department of finance would probably rate GDP as of first importance, while the environmental protection department would highly prioritize environmental protection and governance. The media will mainly focus on prominent contradictions in human-nature relationships (such as Amazon rainforest deforestation( https://www.bbc.com/news/world-latin-america-46327634), and the cancer village(② https://www.theguardian.com/world/2013/jun/04/china-villages-cancer-deaths)) to enhance news viewership and readership as much as possible. The enterprise will focus on maximizing its own economic benefits. Because in intra-organizational coupling the members are mainly in the same interest group, the conflict is relatively small. Therefore, the research objects and goals are clear, and it is easy to grasp the core issues for analysis.
Inter-organizational coupling refers to the complex interest game strategy to tradeoff economic development and environmental protection between different organizations and stakeholders. Figure 7 is a schematic diagram of inter-organizational coupling. The CHANS is still represented by an open and continuously rotating sphere, which contains different organizations, such as the public, government, media, enterprise, scholars, and NGOs. Most of the eco- environmental issues involve multiple stakeholders playing a complex dynamic evolutionary game (Bäckstrand, 2003; Wu et al., 2017). Compared with intra- organization coupling, the factors in CHANS driven by different organizations are more complex. How to achieve equity and sustainability between different organizations is a complex interactive question (Leach et al., 2018). The direction and speed of the coupling sphere are determined by the joint efforts of the public, government, media, enterprise and other organizations. Self-organization and other-organization driving forces exist simultaneously. In the evolution process of the coupling sphere, the number of organizations involved, and the forces of different organizations will change accordingly. For example, in the early stages of industrialization of Europe, environmental governance was not given enough attention, and NGOs did not emerge. In the middle and late stages of industrialization, the power of environmental protection organizations gradually increased. Inter-organizational coupling between humans and nature affects the formulation and implementation of climate and environmental governance decisions and further affects overall social development and human wellbeing (Newig and Fritsch, 2009).
Figure 7 Inter-organizational couplings of human-nature systems

Full size|PPT slide

There are many examples of inter-organizational coupling, for example, the attention and participation of citizens to the eco-environment for different stakeholders has a significant impact on the local environmental governance (Fu and Liu, 2017; Xu et al., 2006). Stakeholders such as government, farmers, media, NGOs, and scholars have different roles and behavioral responses in the mechanism of ecological compensation (Liu et al., 2008). With the gradual change in the environmental management paradigm, from management and participatory management to governance, the collaborative environmental governance model, with multiple social agents, has been strengthened (Armitage et al., 2009; Bodin, 2017).

4.5 Comparison of four-dimensional coupling types in CHNC

Based on the above analysis of the four dimensions of CHNC, we further summarize the basic meanings, conceptual sketches, quantitative methods, and typical cases of eight coupling types, including pericoupling and telecoupling, syncoupling and lagcoupling, apparent coupling and hidden coupling, and intra-organizational coupling and inter-organizational coupling. As shown in the conceptual sketches in Table 1, the square represents humans, the triangle nature, the ellipse the areal system, the circle the organization group, and the double-sided arrow represents interaction and coupling. The quantitative analysis methods listed in the table can solve some issues in a particular dimension, which can be used for empirical research (Carlson et al., 2018). For example, telecoupling can be simulated using methods such as spatial metrology, the multi-regional input-output model and the hierarchical spatial autoregressive model (Dong and Harris, 2015). Lagcoupling calculations can refer to a time-delay model or dynamic general equilibrium model, for example. Hidden coupling can be simulated using the mediating effects model (Preacher and Kelley, 2011) and various environmental footprint methods. Multi-agent modeling, complex networks and big data analysis can be used to study inter-organizational coupling (An et al., 2014). Relevant cases within a traditional research framework are omitted, and only typical cases of telecoupling, lagcoupling, hidden coupling and inter-coupling are listed in Table 1.
Table 1 Comparison of different coupling types in the Coupled Human and Natural Cube
Conceptual framework Analysis dimensions Coupling type Concept Diagram Research methods Typical cases
“CHNC” Space Intracoupling Interaction between subsystems, as well as the elements within the particular areal system.


































Statistics, coupling degree, coupling coordination degree, etc. Omitted
Telecoupling Interaction between humans and nature in different remote areal systems, or in different spatial scales. Two categories: Multi- regional telecoupling (MRTC) and multi- scale telecoupling (MSTC). Multi-region input-output model, spatial Durbin model, hierarchical spatial autoregressive model, network analysis, material flow analysis, energy flow analysis, etc. MRTC: Water diversion, industry transfer, tourism, international trade, technology transfer, investment; MSTC: Local responses to climate change, global diffusion of local pollution
Time Syncoupling Interaction effect between humans and nature occurring in a similar time section. Statistics, coupling degree, coupling coordination degree, time series analysis, etc. Omitted
Lagcoupling Interaction and feedback between humans and nature in different time periods; the causal chain has relative long time intervals. Time-delay model, dynamic general equilibrium model, multi-level temporal autoregressive modeling, etc. The time lag effect of environmental investment on local eco-environment; the 1.5 C global warming target in the Paris Agreement has important effect for current policy.
Appear-
ance
Apparent coupling Direct interaction between subsystems; elements within the CHANS and causal chain are A→B Correlations analysis, linear regression analysis, coupling degree, coupling coordination degree, etc. Omitted
Hidden coupling Interaction between elements or systems is not direct, but works indirectly through a mediator or through an implied system or element, and the causal chain is A→C→B or A(C)→B. Mediating effects model, multi-region input-output model, environmental footprint, life cycle assessment, etc. A→C→B: Urbanization has indirect effects on carbon emissions by influencing the structure and intensity of energy consumption; A(C)→B: Pollutants, carbon emissions, virtual water hidden in international trade.
Organization Intra-
organizational
coupling
Interaction between humans and nature in a particular organization. Statistics, game theory, etc. Omitted
Inter-
organizational coupling
Complex interest game to tradeoff human development and environment between different organizations and stakeholders. Game theory, multi-agent modeling, complex adaptive systems theory, multicenter self-organization theory, complex networks, big data analysis, etc. Stakeholders such as government, farmers, medias and NGOs have different roles and behavioral responses in ecological compensation.
It should be noted that the eight coupling types of CHNC are relative and dialectical. The length in the space dimension is mainly talked in a particular spatial scale. The length in the time dimension is mostly measured in years in the specific study. The appearance dimension is largely based on a current cognitive level. For the organization dimension, inter-organizational coupling and intra-organizational coupling change with people’s values. Therefore, four-dimensional analysis of the CHNC framework should be conducted in a specific application, and the system thinking and dialectical thinking of unity and opposites should be established.

5 Discussion

5.1 Human-nature coupling matrix based on Coupled Human and Natural Cube

Using complexity science and metaphorical analogy, this paper constructs a multi-scale hierarchical nested complex system of the Coupled Human and Natural Cube by making the four dimensions of time, space, organization, and appearance in the analytical framework. This framework is an effective way to analyze the dynamic evolution mechanism of CHANS.
Any CHANS inevitably exists in time and space in the real world, most of which belong to an organization, and have some hidden sides. Therefore, most of the CHANS have the interaction coupling effect of multiple dimensions simultaneously. The four dimensions of the CHNC also exist simultaneously and are dialectically unified. As shown in Table 2, based on practical human wellbeing orientation, the coupling effect of any two dimensions can be expressed by a two-dimensional matrix, which we call the “coupling matrix.” For example, the issue of virtual water in cross-regional trade mentioned above is mainly the integration of telecoupling and hidden coupling. The Qinghai-Tibet Plateau, often termed the Third Pole, saw its number of tourists reach 61 million in 2018. Local government, enterprise, Buddhists and tourists place different values on the fragile ecological environment. Meanwhile, the impact of global tourists on the ecology of the Third Pole is becoming increasingly significant. This is an integration of inter-organizational coupling and telecoupling.
Table 2 Human-nature coupling matrix
Analysis dimension Space Time Appearance Organization
Space Intracoupling or telecoupling Intracoupling or telecoupling + syncoupling or lagcoupling Intracoupling or telecoupling + apparent or hidden coupling Intracoupling or telecoupling + intra-organizational or inter- organizational coupling
Time Syncoupling or lagcoupling + intracoupling or telecoupling Syncoupling or lagcoupling Syncoupling or lagcoupling + apparent or hidden coupling Syncoupling or lagcoupling + intra-organizational or inter-organizational coupling
Appearance Apparent or hidden coupling + intracoupling or telecoupling Apparent or hidden coupling + syncoupling or lagcoupling Apparent or hidden coupling Apparent or hidden coupling + intra-organizational or inter-organizational coupling
Organization Intra-organizational or inter-organizational coupling + intracoupling or telecoupling Intra-organizational or inter-organizational coupling + syncoupling or lagcoupling Intra-organizational or inter-
organizational coupling + apparent or hidden coupling
Intra-organizational or inter-organizational coupling
In theory, a more complex combined matrix of three-dimensional or four-dimensional coupling effects can also be produced. For example, China’s imports of soybeans from the US have increased in recent years, affecting farmers in rival Brazil; meanwhile, environmental groups and scholars are concerned about China’s decision to replace soybeans with wheat, corn and other crops, and to apply more nitrogen fertilizer, as well as increase non-point source pollution over time. This example involves multiple interweaved dimensions of telecoupling, lagcoupling, hidden coupling, and inter-organizational coupling. When we deal with similar practical issues, beginning from a system perspective is a good choice. First, we can conduct a macroscopic qualitative analysis of the issue from the dimensions of time, space, appearance, and organization. Then, we can choose one or two dimensions, according to the degree of importance, to solve the most prominent contradictions in the system; that is, to adopt the idea of “systematic thinking, first heavy then light, break through one by one.” Therefore, the Coupled Human and Natural Cube provides a relatively clear analytical framework for us to analyze the complex human-nature relationship.

5.2 Implications of the Coupled Human and Natural Cube

The framework of CHNC is a logical extension of research on coupled human and natural systems from the perspectives of time, space, appearance and organization. It is the development and deepening of human-earth areal system theory in the new era, which makes up for deficiencies in the traditional framework and it has a general significance for studying CHANS. Different from the human-earth areal system, telecoupling, and planetary urbanization, the main contribution of this framework is providing a considerably comprehensive and interdisciplinary conceptual framework to recognize the evolution and coupling mechanism of the human-nature system. This framework can enrich sustainability science (Kates et al., 2001; Clark, 2016), enhance the paradigm of comprehensive geographic research, and help to better assess the evolution mechanism of the complex human-nature system against the background of global climate change and frequent disasters. It provides a new analytical framework for the regulation and optimization of the human-nature system within the context of ecological civilization and sustainable development; it also helps to enhance the effectiveness and sustainability of regional policy formulation.
The CHNC helps form a comprehensive, steric and multi-dimensional system view to cognize the world. It emphasizes that humans and nature are unity of opposites, like two sides of a coin, and they are an organic whole that interacts, depending on and containing each other, constituting our world. This view accords with the concept of strong sustainability, which assumes that man-made and natural capital are basically complements, not substitutes (Wu, 2013).
This framework focuses more on positive and negative feedback, spatial spillover, mediating, time lag, stakeholder effects, and so on. When exploring the coupling mechanism of the human-earth system, it helps us to have a holistic view. A comprehensive analysis, involving the analysis of the hidden interactions, “the submerged part of the iceberg,” such as telecoupling, lagcoupling, hidden coupling, and inter-organizational coupling is crucial when regulating the relationship between humans and nature; merely assessing the surface interactions provides a grossly incomplete picture of this relationship. In governmental decision-making, emphasis should be placed on evaluating and balancing the intracoupling and telecoupling, syncoupling and lagcoupling, apparent coupling and hidden coupling, and intra-organizational coupling and inter-organizational coupling effects between the social economy and eco-environment.
The CHNC inspires us to rethink the first law of geography of Tobler in the information age (Tobler, 2004). In many cases, two systems that are far apart may be closely related; conversely, some systems are close, but their connections are weak because they exist in different organizations. In the new era, telecoupling and hidden coupling may have posed certain challenges to Tobler’s first law. How to reappraise the first law of geography and develop it, with the possible introduction of new rules, is worth further consideration.

5.3 Quantitative research on the Coupled Human and Natural Cube

This paper has proposed a preliminary conceptual framework. How to measure and simulate the CHNC using specific quantitative models is also an important issue. For each dimension, quantitative analysis methods are found in Table 1. For the evaluation of the overall evolution of the CHNC, the law of thermodynamics and the concept of information entropy may be used. With the development of complexity science, system dynamics, big data, and artificial intelligence, quantitative models of different dimensions should be integrated within the framework of CHNC to gradually form a set of useful methods including description, simulation, prediction, and evaluation (Li et al., 2018). In the future, the analytical framework and quantitative methods of the CHNC will be used in typical practices to further perfect the theory, and to render it more applicable in the field (Xiang, 2016).

6 Conclusions

(1) The conflict and disharmony between humans and nature are the root causes of global ecological and environmental problems. The socio-economic system and natural system have their own evolution laws and constraints. Through continuous material circulation, energy flow and information transmission, humans and nature form a giant, complex, coupled system, comprised of interrelated elements supported and constrained by each other. Through interactions with the external environment and subsystems in a certain time and space dimension, the evolution of the coupled system is based on a self-organizing fluctuation process from chaotic state to orderly structure. Normally, the system is in a mid-state between order and disorder
(2) Inspired by theories, including the human-earth areal system, telecoupling framework and planetary urbanization, we extend the connotation of the coupled human and natural systems (CHANS) and its four dimensions—space, time, appearance, and organization, and a novel framework, “Coupled Human and Natural Cube (CHNC),” is proposed to explain the coupling mechanism between human and natural environments. There exist various “coupling lines” in the CHNC, which connect different systems and elements at multiple scales, forming a larger, nested, interconnected, organic system. The rotation of the Rubik's cube represents the spatiotemporal nonlinear fluctuation of the CHANS. When the color of each surface is the same, all subsystems are developing synergistically in different regions. As the system continually exchanges energy with the environment, a critical phase transition occurs when fluctuation reaches a certain threshold, leading to emergent behaviors of the system. The system can now become more orderly or collapse into the next cycle.
(3) The CHNC is interrelated and dialectically unified in the four dimensions of time, space, organization, and appearance, and includes eight types of coupling: intracoupling, telecoupling, syncoupling, lagcoupling, apparent coupling, hidden coupling, intra-organizational coupling, and inter-organizational coupling. Telecoupling refers to the interactions between humans and nature in different remote areal systems, or at different spatial scales. Lagcoupling refers to the interaction and feedback between human and nature systems in different time periods, in which the causal chain has relatively long time intervals. Hidden coupling is the process of interaction and influence between elements or systems that is not direct but works indirectly through a mediator or through an implied system or element. Inter-organizational coupling refers to the complex interest game strategy to tradeoff economic development and environmental protection between different organizations and stakeholders. This paper also summarizes research methods and typical cases of different coupling types. Finally, based on the CHNC, we put forward a general analysis framework of the human-nature coupling matrix to integrate multiple dimensions. Facing the complex human-nature system, we should follow the analytical paths of “systematic thinking, first heavy then light, break through one by one.”

References

[1]
Adachi S A, Kimura F, Kusaka H et al., 2013. Comparison of the impact of global climate changes and urbanization on summertime future climate in the Tokyo Metropolitan Area. Journal of Applied Meteorology & Climatology, 51(8):1441-1454.
[2]
Adger W N, Benjaminsen T A, Brown K et al., 2001. Advancing a political ecology of global environmental discourses. Development and Change, 32(4):681-715.
[3]
Agyeman J, Bullard R D, Evans B , 2002. Exploring the nexus: Bringing together sustainability, environmental justice and equity. Space & Polity, 6(1):77-90.
[4]
Alberti M , 2008. Advances in Urban Ecology: Integrating Humans and Ecological Processes in Urban Ecosystems. New York: Springer.
[5]
Alberti M , 2015. Eco-evolutionary dynamics in an urbanizing planet. Trends in Ecology & Evolution, 30(2):114-126.
A great challenge for ecology in the coming decades is to understand the role humans play in eco-evolutionary dynamics. If, as emerging evidence shows, rapid evolutionary change affects ecosystem functioning and stability, current rapid environmental change and its evolutionary effects might have significant implications for ecological and human wellbeing on a relatively short time scale. Humans are major selective agents with potential for unprecedented evolutionary consequences for Earth's ecosystems, especially as cities expand rapidly. In this review, I identify emerging hypotheses on how urbanization drives eco-evolutionary dynamics. Studying how human-driven micro-evolutionary changes interact with ecological processes offers us the chance to advance our understanding of eco-evolutionary feedbacks and will provide new insights for maintaining biodiversity and ecosystem function over the long term.
[6]
An L, Zvoleff A, Liu J G et al., 2014. Agent-based modeling in coupled human and natural systems (CHANS): Lessons from a comparative analysis. Annals of the Association of American Geographers, 104(4):723-745.
[7]
Armitage D R, Plummer R, Berkes F et al., 2009. Adaptive co-management for social-ecological complexity. Frontiers in Ecology and the Environment, 7(2):95-102.
[8]
Bäckstrand K , 2003. Civic science for sustainability: Reframing the role of experts, policy-makers and citizens in environmental governance. Global Environmental Politics, 3(4):24-41.
[9]
Bai X, Mcphearson T, Cleugh H et al., 2016. Linking urbanization and the environment: Conceptual and empirical advances. Annual Review of Environment & Resources, 42(1):215-240.
[10]
Bak P , 2013. How Nature Works: The Science of Self-organized Criticality. Berlin: Springer Science & Business Media.
[11]
Batty M , 2013. The New Science of Cities. Boston: MIT Press.
[12]
Bodin Ö , 2017. Collaborative environmental governance: Achieving collective action in social-ecological systems. Science, 357(6352). doi: 10.1126/science.aan1114.
[13]
Boumans R, Roman J, Altman I et al., 2015. The multiscale integrated model of ecosystem services (MIMES): Simulating the interactions of coupled human and natural systems. Ecosystem Services, 12:30-41.
[14]
Brenner N , 2000. The urban question: Reflections on Henri Lefebvre, urban theory and the politics of scale. International Journal of Urban and Regional Research, 24(2):361-378.
[15]
Brenner N , 2013. Theses on urbanization. Public Culture, 25(1):85-114.
[16]
Brenner N, Schmid C , 2011. Planetary urbanization. In: Gandy M. Urban Constellations. Berlin: Jovis.
[17]
Brenner N, Schmid C , 2014. Implosions/Explosions: Towards a Study of Planetary Urbanization. Berlin: Jovis.
[18]
Buckley M, Strauss K , 2016. With, against and beyond Lefebvre: Planetary urbanization and epistemic plurality. Environment and Planning D: Society and Space, 34(4):617-636.
[19]
Carlson A, Zaehringer J, Garrett R et al., 2018. Toward rigorous telecoupling causal attribution: A systematic review and typology. Sustainability, 10(12):4426.
[20]
Carlson A K, Taylor W W, Liu J et al., 2017. The telecoupling framework: An integrative tool for enhancing fisheries management. Fisheries, 42(8):395-397.
[21]
Chapin F S, Power M E, Pickett S T et al., 2011. Earth stewardship: Science for action to sustain the human-earth system. Ecosphere, 2(8):1-20.
[22]
Clark W C, Van Kerkhoff L, Lebel L et al., 2016. Crafting usable knowledge for sustainable development. Proceedings of the National Academy of Sciences, 113(17):4570-4578.
This paper distills core lessons about how researchers (scientists, engineers, planners, etc.) interested in promoting sustainable development can increase the likelihood of producing usable knowledge. We draw the lessons from both practical experience in diverse contexts around the world and from scholarly advances in understanding the relationships between science and society. Many of these lessons will be familiar to those with experience in crafting knowledge to support action for sustainable development. However, few are included in the formal training of researchers. As a result, when scientists and engineers first venture out of the laboratory or library with the goal of linking their knowledge with action, the outcome has often been ineffectiveness and disillusionment. We therefore articulate here a core set of lessons that we believe should become part of the basic training for researchers interested in crafting usable knowledge for sustainable development. These lessons entail at least four things researchers should know, and four things they should do. The knowing lessons involve understanding the coproduction relationships through which knowledge making and decision making shape one another in social-environmental systems. We highlight the lessons that emerge from examining those coproduction relationships through the ICAP lens, viewing them from the perspectives of Innovation systems, Complex systems, Adaptive systems, and Political systems. The doing lessons involve improving the capacity of the research community to put its understanding of coproduction into practice. We highlight steps through which researchers can help build capacities for stakeholder collaboration, social learning, knowledge governance, and researcher training.
[23]
Costanza R, Wainger L, Folke C , et al., 1993. Modeling complex ecological economic systems: Toward an evolutionary, dynamic understanding of people and nature. BioScience, 43(8):545-555.
[24]
Cui X, Fang C, Liu H et al., 2019. Assessing sustainability of urbanization by a coordinated development index for an urbanization-resources-environment complex system: A case study of Jing-Jin-Ji region, China. Ecological Indicators, 96:383-391.
[25]
Daily G C , 1997. Nature’s Services. Washington, D. C.: Island Press.
[26]
Dalin C, Hanasaki N, Qiu H et al., 2014. Water resources transfers through Chinese interprovincial and foreign food trade. Proceedings of the National Academy of Sciences, 111(27):9774-9779.
Abstract
China's water resources are under increasing pressure from socioeconomic development, diet shifts, and climate change. Agriculture still concentrates most of the national water withdrawal. Moreover, a spatial mismatch in water and arable land availability--with abundant agricultural land and little water resources in the north--increases water scarcity and results in virtual water transfers from drier to wetter regions through agricultural trade. We use a general equilibrium welfare model and linear programming optimization to model interprovincial food trade in China. We combine these trade flows with province-level estimates of commodities' virtual water content to build China's domestic and foreign virtual water trade network. We observe large variations in agricultural water-use efficiency among provinces. In addition, some provinces particularly rely on irrigation vs. rainwater. We analyze the virtual water flow patterns and the corresponding water savings. We find that this interprovincial network is highly connected and the flow distribution is relatively homogeneous. A significant share of water flows is from international imports (20%), which are dominated by soy (93%). We find that China's domestic food trade is efficient in terms of rainwater but inefficient regarding irrigation, meaning that dry, irrigation-intensive provinces tend to export to wetter, less irrigation-intensive ones. Importantly, when incorporating foreign imports, China's soy trade switches from an inefficient system to a particularly efficient one for saving water resources (20 km(3)/y irrigation water savings, 41 km(3)/y total). Finally, we identify specific provinces (e.g., Inner Mongolia) and products (e.g., corn) that show high potential for irrigation productivity improvements.
[27]
Daly H E , 1995. On Wilfred Beckerman's critique of sustainable development. Environmental Values, 4(1):49-55.
[28]
Deines J M, Liu X, Liu J , 2016. Telecoupling in urban water systems: An examination of Beijing’s imported water supply. Water International, 41(2):251-270.
We report here a novel method for blocking acute platelet deposition at the site of vessel injury by molecularly masking thrombogenic vascular wall proteins with covalently attached polyethylene glycol (PEG). To evaluate this technique, blood containing 111In-labeled platelets was perfused over damaged human placental arteries for 2 min at a wall shear rate of 200 s-1. Denuded vessel segments were incubated for 30, 15, 5, and 1 min with a solution of either reactive PEG-diisocyanate (PEG-ISO) or nonreactive PEG-dihydroxyl (PEG-OH). Vessels treated with PEG-ISO for 1 min exhibited 87 +/- 12% less platelet deposition (p < 0.01) than untreated control vessels, and this reduction did not vary significantly among treatment times, indicating that this reaction occurs rapidly enough to be clinically applicable. To investigate the duration of this thrombotic barrier, denuded pig carotid arteries were treated with reactive PEG-ISO for 1 min, perfused with plasma for 30 min, and then perfused with blood containing radiolabeled platelets. PEG-ISO-treated arteries exhibited 84 +/- 9% less platelet deposition (p < 0.05) than untreated controls. These data demonstrate that damaged arterial surfaces can be rendered resistant to platelet deposition after short contact periods with reactive PEG. Molecular PEG barriers ultimately might find application following vascular procedures to sterically inhibit blood cell interaction with damaged vascular surfaces.
[29]
Dietz T , 2017. Drivers of human stress on the environment in the twenty-first century. Annual Review of Environment & Resources, 42(1):189-213.
[30]
Dietz T, Ostrom E, Stern P C , 2003. The struggle to govern the commons. Science, 302(5652):1907-1912.
Human institutions--ways of organizing activities--affect the resilience of the environment. Locally evolved institutional arrangements governed by stable communities and buffered from outside forces have sustained resources successfully for centuries, although they often fail when rapid change occurs. Ideal conditions for governance are increasingly rare. Critical problems, such as transboundary pollution, tropical deforestation, and climate change, are at larger scales and involve nonlocal influences. Promising strategies for addressing these problems include dialogue among interested parties, officials, and scientists; complex, redundant, and layered institutions; a mix of institutional types; and designs that facilitate experimentation, learning, and change.
[31]
Dong G, Harris R , 2015. Spatial autoregressive models for geographically hierarchical data structures. Geographical Analysis, 47(2):173-191.
[32]
Fan J, Wang Y, Ouyang Z et al., 2017. Risk forewarning of regional development sustainability based on a natural resources and environmental carrying index in China. Earth’s Future, 5(2):196-213.
[33]
Fang B, Tan Y, Li C et al., 2016a. Energy sustainability under the framework of telecoupling. Energy, 106:253-259.
[34]
Fang C, Liu H, Li G , 2016b. International progress and evaluation on interactive coupling effects between urbanization and the eco-environment. Journal of Geographical Sciences, 26(8):1081-1116.
[35]
Fang C, Liu H, Li G et al., 2015. Estimating the impact of urbanization on air quality in China using spatial regression models. Sustainability, 7(11):15570-15592.
[36]
Fang C, Ren Y , 2017. Analysis of emergy-based metabolic efficiency and environmental pressure on the local coupling and telecoupling between urbanization and the eco-environment in the Beijing-Tianjin-Hebei urban agglomeration. Science China-Earth Sciences, 60(6):1083-1097.
[37]
Fang C, Yang Y , 2006. Basic laws of the interactive coupling system of urbanization and ecological environment. Arid Land Geography, 29(1):1-8. (in Chinese)
[38]
Fang K, Heijungs R, de Snoo G R , 2014. Theoretical exploration for the combination of the ecological, energy, carbon, and water footprints: Overview of a footprint family. Ecological Indicators, 36:508-518.
[39]
Folke C , 2006. Resilience: The emergence of a perspective for social-ecological systems analyses. Global Environmental Change, 16(3):253-267.
[40]
Friedman T L , 2005. The World is Flat: A Brief History of the Twenty-first Century. London: Macmillan.
[41]
Fu B, Wang S, Zhang J , et al., 2019. Unravelling the complexity in achieving the 17 sustainable development goals. National Science Review, 6(3):386-388.
[42]
Fu H, Liu X , 2017. Research on the phenomenon of Chinese residents’ spiritual contagion for the reuse of recycled water based on SC-IAT. Water, 9(11):846.
[43]
Glaser M, Krause G, Ratter B M et al., 2012. Human-nature Interactions in the Anthropocene: Potentials of Social-ecological Systems Analysis. London: Routledge.
[44]
Goudie A S , 2013. The Human Impact on the Natural Environment: Past, Present, And Future. New Jersey: John Wiley & Sons.
[45]
Gunderson L H, Holling C S , 2001. Panarchy: Understanding Transformations in Human and Natural Systems. Washington, D. C.: Island Press.
[46]
Hau J L, Bakshi B R , 2004. Promise and problems of emergy analysis. Ecological Modelling, 178(1/2):215-225.
[47]
Holling C S , 2001. Understanding the complexity of economic, ecological, and social systems. Ecosystems, 4(5):390-405.
[48]
Hummel D, Adamo S, Sherbinin A D et al., 2013. Inter- and transdisciplinary approaches to population-environment research for sustainability aims: A review and appraisal. Population & Environment, 34(4):481-509.
[49]
Jiang B, Ma D , 2018. How complex is a fractal? Head/tail breaks and fractional hierarchy. Journal of Geovisualization & Spatial Analysis, 2(1):1-6.
[50]
Kates R W, Clark W C, Corell R et al., 2001. Sustainability science. Science, 292(5517):641-642.
[51]
Kripalani R H, Kulkarni A , 2001. Monsoon rainfall variations and teleconnections over South and East Asia. International Journal of Climatology, 21(5):603-616.
[52]
Leach M, Reyers B, Bai X et al., 2018. Equity and sustainability in the Anthropocene: A social-ecological systems perspective on their intertwined futures. Global Sustainability, 1(e13):1-13.
[53]
Lee S, Ho C H, Yun G L et al., 2013. Influence of transboundary air pollutants from China on the high-PM10 episode in Seoul, Korea for the period October 16-20, 2008. Atmospheric Environment, 77(3):430-439.
[54]
Li J , 2016. Exploring the logic and landscape of the knowledge system: Multilevel structures, each multiscaled with complexity at the mesoscale. Engineering, 2(3):276-285.
[55]
Li R, Dong L, Zhang J et al., 2017a. Simple spatial scaling rules behind complex cities. Nature Communications, 8(1):1841.
Although most of wealth and innovation have been the result of human interaction and cooperation, we are not yet able to quantitatively predict the spatial distributions of three main elements of cities: population, roads, and socioeconomic interactions. By a simple model mainly based on spatial attraction and matching growth mechanisms, we reveal that the spatial scaling rules of these three elements are in a consistent framework, which allows us to use any single observation to infer the others. All numerical and theoretical results are consistent with empirical data from ten representative cities. In addition, our model can also provide a general explanation of the origins of the universal super- and sub-linear aggregate scaling laws and accurately predict kilometre-level socioeconomic activity. Our work opens a new avenue for uncovering the evolution of cities in terms of the interplay among urban elements, and it has a broad range of applications.
[56]
Li X, Cheng G, Lin H et al., 2018. Watershed system model: The essentials to model complex human-nature system at the river basin scale. Journal of Geophysical Research: Atmospheres, 123(6):3019-3034.
[57]
Li X, Yang Y, Liu Y , 2017b. Research progress in man-land relationship evolution and its resource-environment base in China. Journal of Geographical Sciences, 27(8):899-924.
[58]
Liu H, Fang C, Mao H et al., 2016a. Mechanism of oasis urbanization: A theoretical framework based on complexity theory. Geographical Research, 35(2):242-255. (in Chinese)
Tandem mass spectrometry of a mixture of two peptides that differ from each other by a single mass unit due to mutation is presented. The mutant beta-globin of hemoglobin Hoshida is present along with the normal counterpart, and the amino acid substitution of glutamine for glutamic acid is located within tryptic peptide T5 of M(r) 2057. 9. The mass of the mutated peptide is 1 u lower. In the isotopic cluster for the doubly charged ion of the peptide T5, the resolved ion with mass of 1030.0 represents the normal peptide with 93 (12)C atoms and the mutated one with 92 (12)C and one (13)C atoms. Collision-induced dissociation (CID) of this composite ion identified the mutation by presenting a key fragment derived from the (12)C-only mutant peptide, as reported in a previous study. Similarly, when an ion containing multiple (13)C atoms was selected as a precursor for CID, the mutation could be identified, even in large fragments, by a marked change in the shape of the isotopic cluster for the consecutive product ions. This study demonstrates the merit of selecting a resolved ion rather than the whole isotopic cluster as a precursor in the CID measurements of large peptides or proteins for characterizing heterozygous mutations.
[59]
Liu H, Fang C, Miao Y et al., 2018a. Spatio-temporal evolution of population and urbanization in the countries along the Belt and Road 1950-2050. Journal of Geographical Sciences, 28(7):919-936.
[60]
Liu H, Fang C, Sun S , 2017a. Digital inequality in provincial China. Environment and Planning A, 49(10):2179-2182.
[61]
Liu H, Fang C, Zhang X et al., 2017b. The effect of natural and anthropogenic factors on haze pollution in Chinese cities: A spatial econometrics approach. Journal of Cleaner Production, 165:323-333.
[62]
Liu H, Shi P, Yang X et al., 2014a. Self-organization evolution simulation and empirical study of Human-water System. Journal of Natural Resources, 29(4):709-718. (in Chinese)
[63]
Liu J , 2017. Integration across a metacoupled world. Ecology and Society, 22(4):29.
In today's society, it becomes increasingly important to assess which non-human and non-verbal beings possess consciousness. This review article aims to delineate criteria for consciousness especially in animals, while also taking into account intelligent artifacts. First, we circumscribe what we mean with "consciousness" and describe key features of subjective experience: qualitative richness, situatedness, intentionality and interpretation, integration and the combination of dynamic and stabilizing properties. We argue that consciousness has a biological function, which is to present the subject with a multimodal, situational survey of the surrounding world and body, subserving complex decision-making and goal-directed behavior. This survey reflects the brain's capacity for internal modeling of external events underlying changes in sensory state. Next, we follow an inside-out approach: how can the features of conscious experience, correlating to mechanisms inside the brain, be logically coupled to externally observable ("outside") properties? Instead of proposing criteria that would each define a "hard" threshold for consciousness, we outline six indicators: (i) goal-directed behavior and model-based learning; (ii) anatomic and physiological substrates for generating integrative multimodal representations; (iii) psychometrics and meta-cognition; (iv) episodic memory; (v) susceptibility to illusions and multistable perception; and (vi) specific visuospatial behaviors. Rather than emphasizing a particular indicator as being decisive, we propose that the consistency amongst these indicators can serve to assess consciousness in particular species. The integration of scores on the various indicators yields an overall, graded criterion for consciousness, somewhat comparable to the Glasgow Coma Scale for unresponsive patients. When considering theoretically derived measures of consciousness, it is argued that their validity should not be assessed on the basis of a single quantifiable measure, but requires cross-examination across multiple pieces of evidence, including the indicators proposed here. Current intelligent machines, including deep learning neural networks (DLNNs) and agile robots, are not indicated to be conscious yet. Instead of assessing machine consciousness by a brief Turing-type of test, evidence for it may gradually accumulate when we study machines ethologically and across time, considering multiple behaviors that require flexibility, improvisation, spontaneous problem-solving and the situational conspectus typically associated with conscious experience.
[64]
Liu J, Dietz T, Carpenter S R et al., 2007a. Complexity of coupled human and natural systems. Science, 317(5844):1513-1516.
Integrated studies of coupled human and natural systems reveal new and complex patterns and processes not evident when studied by social or natural scientists separately. Synthesis of six case studies from around the world shows that couplings between human and natural systems vary across space, time, and organizational units. They also exhibit nonlinear dynamics with thresholds, reciprocal feedback loops, time lags, resilience, heterogeneity, and surprises. Furthermore, past couplings have legacy effects on present conditions and future possibilities.
[65]
Liu J, Hull V, Batistella M et al., 2013. Framing sustainability in a telecoupled world. Ecology and Society, 18(2):26.
[66]
Liu J, Hull V, Godfray H C J et al., 2018b. Nexus approaches to global sustainable development. Nature Sustainability, 1(9):466.
[67]
Liu J, Hull V, Moran E et al., 2014b. Applications of the telecoupling framework to land-change science. In: Rethinking Global Land Use in an Urban Era. Boston: MIT Press.
[68]
Liu J, Li S, Ouyang Z et al., 2008. Ecological and socioeconomic effects of China’s policies for ecosystem services. Proceedings of the National Academy of Sciences, 105(28):9477-9482.
To address devastating environmental crises and to improve human well-being, China has been implementing a number of national policies on payments for ecosystem services. Two of them, the Natural Forest Conservation Program (NFCP) and the Grain to Green Program (GTGP), are among the biggest programs in the world because of their ambitious goals, massive scales, huge payments, and potentially enormous impacts. The NFCP conserves natural forests through logging bans and afforestation with incentives to forest enterprises, whereas the GTGP converts cropland on steep slopes to forest and grassland by providing farmers with grain and cash subsidies. Overall ecological effects are beneficial, and socioeconomic effects are mostly positive. Whereas there are time lags in ecological effects, socioeconomic effects are more immediate. Both the NFCP and the GTGP also have global implications because they increase vegetative cover, enhance carbon sequestration, and reduce dust to other countries by controlling soil erosion. The future impacts of these programs may be even bigger. Extended payments for the GTGP have recently been approved by the central government for up to 8 years. The NFCP is likely to follow suit and receive renewed payments. To make these programs more effective, we recommend systematic planning, diversified funding, effective compensation, integrated research, and comprehensive monitoring. Effective implementation of these programs can also provide important experiences and lessons for other ecosystem service payment programs in China and many other parts of the world.
[69]
Liu J, Mooney H, Hull V et al., 2015. Sustainability: Systems integration for global sustainability. Science, 347(6225):1258832
Global sustainability challenges, from maintaining biodiversity to providing clean air and water, are closely interconnected yet often separately studied and managed. Systems integration—holistic approaches to integrating various components of coupled human and natural systems—is critical to understand socioeconomic and environmental interconnections and to create sustainability solutions. Recent advances include the development and quantification of integrated frameworks that incorporate ecosystem services, environmental footprints, planetary boundaries, human-nature nexuses, and telecoupling. Although systems integration has led to fundamental discoveries and practical applications, further efforts are needed to incorporate more human and natural components simultaneously, quantify spillover systems and feedbacks, integrate multiple spatial and temporal scales, develop new tools, and translate findings into policy and practice. Such efforts can help address important knowledge gaps, link seemingly unconnected challenges, and inform policy and management decisions.
[70]
Liu J, Yang W , 2013. Integrated assessments of payments for ecosystem services programs. Proceedings of the National Academy of Sciences, 110(41):16297-16298.
[71]
Liu J, Yang W, Li S , 2016b. Framing ecosystem services in the telecoupled Anthropocene. Frontiers in Ecology & the Environment, 14(1):27-36.
[72]
Liu J G, Dietz T, Carpenter S R et al., 2007b. Complexity of coupled human and natural systems. Science, 317(5844):1513-1516.
Integrated studies of coupled human and natural systems reveal new and complex patterns and processes not evident when studied by social or natural scientists separately. Synthesis of six case studies from around the world shows that couplings between human and natural systems vary across space, time, and organizational units. They also exhibit nonlinear dynamics with thresholds, reciprocal feedback loops, time lags, resilience, heterogeneity, and surprises. Furthermore, past couplings have legacy effects on present conditions and future possibilities.
[73]
Long H, Liu Y, Hou X et al., 2014. Effects of land use transitions due to rapid urbanization on ecosystem services: Implications for urban planning in the new developing area of China. Habitat International, 44:536-544.
[74]
Malhi Y , 2017. The concept of the Anthropocene. Annual Review of Environment and Resources, 42:77-104.
[75]
Marzluff J M, Shulenberger E, Endlicher W et al., 2008. An International Perspective on the Interaction Between Humans and Nature. New York: Springer.
[76]
McDonald R I, Kareiva P, Formana R T T , 2008. The implications of current and future urbanization for global protected areas and biodiversity conservation. Biological Conservation, 141(6):1695-1703.
[77]
McHale M R, Pickett S T A, Barbosa O et al., 2015. The new global urban realm: Complex, connected, diffuse, and diverse social-ecological systems. Sustainability, 7(5):5211-5240.
[78]
Meng J, Liu J, Xu Y et al., 2016. Globalization and pollution: Tele-connecting local primary PM2.5 emissions to global consumption. Proceedings of the Royal Society A: Mathematical Physical and Engineering Sciences, 472(2195). doi: 10.1098/rspa.2016.0380.
Abstract
Globalization pushes production and consumption to geographically diverse locations and generates a variety of sizeable opportunities and challenges. The distribution and associated effects of short-lived primary fine particulate matter (PM2.5), a representative of local pollution, are significantly affected by the consumption through global supply chain. Tele-connection is used here to represent the link between production and consumption activity at large distances. In this study, we develop a global consumption-based primary PM2.5 emission inventory to track primary PM2.5 emissions embodied in the supply chain and evaluate the extent to which local PM2.5 emissions are triggered by international trade. We further adopt consumption-based accounting and identify the global original source that produced the emissions. We find that anthropogenic PM2.5 emissions from industrial sectors accounted for 24 Tg globally in 2007; approximately 30% (7.2 Tg) of these emissions were embodied in export of products principally from Brazil, South Africa, India and China (3.8 Tg) to developed countries. Large differences (up to 10 times) in the embodied emissions intensity between net importers and exporters greatly increased total global PM2.5 emissions. Tele-connecting production and consumption activity provides valuable insights with respect to mitigating long-range transboundary air pollution and prompts concerted efforts aiming at more environmentally conscious globalization.
[79]
Mi Z, Wei Y-M, Wang B et al., 2017. Socioeconomic impact assessment of China’s CO2 emissions peak prior to 2030. Journal of Cleaner Production, 142:2227-2236.
[80]
Morzillo A T, de Beurs K M, Martin-Mikle C J , 2014. A conceptual framework to evaluate human-wildlife interactions within coupled human and natural systems. Ecology and Society, 19(3):44.
[81]
Nagendra H, Bai X, Brondizio E S et al., 2018. The urban south and the predicament of global sustainability. Nature Sustainability, 1(7):341.
This commentary by Maurice King questions the viability of current public health strategies. He advocates for an ecological approach that seeks to improve the health of the entire planet. He discusses the concept of the demographic trap. Being demographically trapped refers to a population being stuck in an "unsustainable state with a high birth rate and death rate, with an ever increasing pressure on its resources, and with a rapidly deteriorating environment". King points out that the possible outcomes are limited for a population that becomes trapped. Some of the possible outcomes include dying from starvation and disease; fleeing as ecological refugees; being destroyed by war or genocide; or being supported by food and other resources from elsewhere, first as emergency relief and then perhaps indefinitely. King believes that ecological collapse has already taken place in parts of Ethiopia and the process may have begun on a wider scale elsewhere. According to King, this ecological predicament can be found in both rural and urban areas in the developing world. This article also discusses the problem of high fertility. King believes that the widely held belief that the necessary and sufficient condition for reducing the birth rate is to reduce the child death rate is erroneous. He states that a causal relationship between the 2 rates is untenable, instead, it is more reasonable to say that both rates respond to other common factors. The author suggests that a fall in the birth rate requires the harnessing of social and economic gains to reduce poverty and promote socio-economic development. He also believes that the continued growth in the size of the world's population is due to declining efforts in family planning and declining child mortality not having its alleged effects on fertility. King also brings forth an ethical dilemma. He asks, "are there some programs which, although they are technically feasible, should not be initiated because of there long-term population-increasing consequences?" He suggests that other factors such as ecological deterioration, integrity of the ecosystem, and the welfare of future communities need to be taken into consideration. King presents a new global strategy based on the concept of "sustainability". He says that "sustainability should be the maintenance of the capacity of the ecosystem to support life in quantity and variety". Specifically, he advocates for consumption control in the industrial North with intensive energy conservation and recycling. In the South, he calls for renewed vigor in family planning efforts. Public health measures need to be understood in terms of their demographic and ecological implications. If measures are found to be desustaining, King says that complementary ecologically sustaining measures should be introduced with them. He also believes that desustaining measures, such as oral rehydration, should not be introduced on a public health scale if no adequately sustaining complementary measures are possible. He asserts that desustaining measures, without complementary interventions, can ultimately increase the man-years of human misery.
[82]
Newig J, Fritsch O , 2009. Environmental governance: Participatory, multi-level and effective? Environmental Policy and Governance, 19(3):197-214.
[83]
Ostrom E , 2009. A general framework for analyzing sustainability of social-ecological systems. Science, 325(5939):419-422.
A major problem worldwide is the potential loss of fisheries, forests, and water resources. Understanding of the processes that lead to improvements in or deterioration of natural resources is limited, because scientific disciplines use different concepts and languages to describe and explain complex social-ecological systems (SESs). Without a common framework to organize findings, isolated knowledge does not cumulate. Until recently, accepted theory has assumed that resource users will never self-organize to maintain their resources and that governments must impose solutions. Research in multiple disciplines, however, has found that some government policies accelerate resource destruction, whereas some resource users have invested their time and energy to achieve sustainability. A general framework is used to identify 10 subsystem variables that affect the likelihood of self-organization in efforts to achieve a sustainable SES.
[84]
Preacher K J, Kelley K , 2011. Effect size measures for mediation models: Quantitative strategies for communicating indirect effects. Psychol Methods, 16(2):93-115.
The statistical analysis of mediation effects has become an indispensable tool for helping scientists investigate processes thought to be causal. Yet, in spite of many recent advances in the estimation and testing of mediation effects, little attention has been given to methods for communicating effect size and the practical importance of those effect sizes. Our goals in this article are to (a) outline some general desiderata for effect size measures, (b) describe current methods of expressing effect size and practical importance for mediation, (c) use the desiderata to evaluate these methods, and (d) develop new methods to communicate effect size in the context of mediation analysis. The first new effect size index we describe is a residual-based index that quantifies the amount of variance explained in both the mediator and the outcome. The second new effect size index quantifies the indirect effect as the proportion of the maximum possible indirect effect that could have been obtained, given the scales of the variables involved. We supplement our discussion by offering easy-to-use R tools for the numerical and visual communication of effect size for mediation effects.
[85]
Qi J G, Chen J Q, Wan S Q et al., 2012. Understanding the coupled natural and human systems in Dryland East Asia. Environmental Research Letters, 7(1):15202-15207.
[86]
Ruf F, Schroth G, Doffangui K , 2015. Climate change, cocoa migrations and deforestation in West Africa: What does the past tell us about the future? Sustainability Science, 10(1):101-111.
[87]
Sherbinin A D, Vanwey L, Mcsweeney K et al., 2008. Rural household demographics, livelihoods and the environment. Global Environmental Change, 18(1):38-53.
This paper reviews and synthesizes findings from scholarly work on linkages among rural household demographics, livelihoods and the environment. Using the livelihood approach as an organizing framework, we examine evidence on the multiple pathways linking environmental variables and the following demographic variables: fertility, migration, morbidity and mortality, and lifecycles. Although the review draws on studies from the entire developing world, we find the majority of micro-level studies have been conducted in either marginal (mountainous or arid) or frontier environments, especially Amazonia. Though the linkages are mediated by many complex and often context-specific factors, there is strong evidence that dependence on natural resources intensifies when households lose human and social capital through adult morbidity and mortality, and qualified evidence for the influence of environmental factors on household decision-making regarding fertility and migration. Two decades of research on lifecycles and land-cover change at the farm level have yielded a number of insights about how households make use of different land-use and natural resource management strategies at different stages. A thread running throughout the review is the importance of managing risk through livelihood diversification, ensuring future income security, and culture-specific norms regarding appropriate and desirable activities and demographic responses. Recommendations for future research are provided.
[88]
Steffen W, Leinfelder R, Zalasiewicz J et al., 2016. Stratigraphic and earth system approaches to defining the Anthropocene. Earth’s Future, 4(8):324-345.
[89]
Steffen W, Richardson K, Rockstrom J et al., 2015. Planetary boundaries: Guiding human development on a changing planet. Science, 347(6223):736. doi: 10.1126/science.1259855.
[90]
Steffen W, Sanderson R A, Tyson P D et al., 2006. Global Change and the Earth System: A Planet under Pressure. Berlin: Springer Science & Business Media.
[91]
Tobler W , 2004. On the first law of geography: A reply. Annals of the Association of American Geographers, 94(2):304-310.
[92]
Tscherning K, Helming K, Krippner B et al., 2012. Does research applying the DPSIR framework support decision making? Land Use Policy, 29(1):102-110.
[93]
Turner B L, Kasperson R E, Matson P A et al., 2003. A framework for vulnerability analysis in sustainability science. Proceedings of the National Academy of Sciences, 100(14):8074-8079.
Global environmental change and sustainability science increasingly recognize the need to address the consequences of changes taking place in the structure and function of the biosphere. These changes raise questions such as: Who and what are vulnerable to the multiple environmental changes underway, and where? Research demonstrates that vulnerability is registered not by exposure to hazards (perturbations and stresses) alone but also resides in the sensitivity and resilience of the system experiencing such hazards. This recognition requires revisions and enlargements in the basic design of vulnerability assessments, including the capacity to treat coupled human-environment systems and those linkages within and without the systems that affect their vulnerability. A vulnerability framework for the assessment of coupled human-environment systems is presented.
[94]
Wang R, Feng L, Dan H et al., 2011. Understanding eco-complexity: Social-economic-natural complex ecosystem approach. Ecological Complexity, 8(1):15-29.
There is a need to find a comprehensive approach focusing on the conflicts between economical growth and environmental protection. Chinese scholars advocate a comprehensive ecosystem viewpoint named social-economic-natural complex ecosystem(SENCE). The kernel of the concept lies in the hierarchical structure of SENCE, through which methods from ecological network can be useful to the compound system. The author gives a schema depicting its structure, following a model analysis to help understand the reliance of economy on ecosystem. It is obvious that more actions should be done to strive for sustainable development.
[95]
Wang Z, Ye X, Lee J et al., 2018. A spatial econometric modeling of online social interactions using microblogs. Computers, Environment and Urban Systems, 70:53-58.
[96]
Warf B , 2008. Time-space Compression: Historical Geographies. London: Routledge.
[97]
Warner K , 2010. Global environmental change and migration: Governance challenges. Global Environmental Change, 20(3):402-413.
Health policy and systems research (HPSR) has changed considerably over the last 20 years, but its main purpose remains to inform and influence health policies and systems. Whereas goals that underpin health systems have endured - such as a focus on health equity - contexts and priorities change, research methods progress, and health organisations continue to learn and adapt, in part by using HPSR. For HPSR to remain relevant, its practitioners need to re-think how health systems are conceptualised, to keep up with rapid changes in how we diagnose and manage disease and use information, and consider factors affecting people's health that go well beyond healthcare systems. The Sustainable Development Goals (SDGs) represent a shifting paradigm in human development by seeking convergence across sectors. They also offer an opportunity for HPSR to play a larger role, given its pioneering work on applying systems thinking to health, its focus on health equity, and the strength of its multi-disciplinary approaches that make it a good fit for the SDG era.Globally, population health is being challenged in different ways, from climate change and growing air pollution and toxic environmental exposure to food insecurity, massive population migration and refugee crises, to emerging and re-emerging diseases. Each of these trends reinforce each other and concentrate their harms on the most vulnerable populations. Multi-level governance, together with novel regulatory strategies and socially oriented investments, are key to successful action against many of the new challenges, with HPSR guiding their design and evolution.The HPSR community cannot be complacent about its successful, yet short, history. Tensions remain about how different stakeholders use HPSR such as the contrast between embedding research within government institutions versus independently evaluating and holding decision-makers accountable. Such tensions are inevitable in the boundary-spanning field that HPSR has become. We should strive to enhance the influence of HPSR by staying relevant in a changing world and embracing the strength of our diversity of disciplines, the range of problems addressed, and the opportunity of the SDGs to ensure that health and social benefits are more inclusive for people within and across countries.
[98]
Werner B, McNamara D , 2007. Dynamics of coupled human-landscape systems. Geomorphology, 91(3):393-407.
[99]
Wu B, Liu P, Xu X , 2017. An evolutionary analysis of low-carbon strategies based on the government-enterprise game in the complex network context. Journal of Cleaner Production, 141:168-179.
[100]
Wu C . 1991. Research core of geography: The human-earth areal systems. Economic Geography, 11(3):1-6. (in Chinese)
[101]
Wu J , 2013. Landscape sustainability science: Ecosystem services and human well-being in changing landscapes. Landscape Ecology, 28(6):999-1023.
[102]
Wu J, Xiang W N, Zhao J , 2014. Urban ecology in China: Historical developments and future directions. Landscape and Urban Planning, 125:222-233.
[103]
Xiang W N , 2016. Ecophronesis: The ecological practical wisdom for and from ecological practice. Landscape and Urban Planning, 155:53-60.
[104]
Xiao Y, Xie G, Zhen L et al., 2017. Identifying the areas benefitting from the prevention of wind erosion by the key ecological function area for the protection of desertification in Hunshandake, China. Sustainability, 9(10):1820.
[105]
Xu J, Chen L, Lu Y et al., 2006. Local people's perceptions as decision support for protected area management in Wolong Biosphere Reserve, China. Journal of Environmental Management, 78(4):362-372.
This paper examines local people's knowledge, attitudes and perceptions towards Wolong Biosphere Reserve (WBR) and its management policies. Pertinent data were collected through a questionnaire survey and group discussions. This study revealed that local people's perceptions were affected by many factors, including education, gender, residence location, household size and acreage of land owned. Although most respondents had limited knowledge about WBR because of their absence in WBR management, they held a positive attitude towards WBR. An in-depth analysis of their attitudes and perceptions showed that two potential conflicts might affect biodiversity conservation and protected area management. One of them was the imbalance between the limited cropland holding and the oversupply of the labor force, and the other one was the increase in electricity price versus the decrease in economic incentives for the Natural Forest Protection Project. The study also revealed that relocation was considered unacceptable to most respondents. However, those residing far from the main road were willing to relocate more than those near the main road. Based on our studies, some recommendations are given for improvement of WBR management.
[106]
Yang D, Cai J, Hull V et al., 2016. New road for telecoupling global prosperity and ecological sustainability. Ecosystem Health & Sustainability, 2(10):e01242.
[107]
York R, Rosa E A, Dietz T , 2003. STIRPAT, IPAT and ImPACT: Analytic tools for unpacking the driving forces of environmental impacts. Ecological Economics, 46(3):351-365.
[108]
Zhang D D, Brecke P, Lee H F et al., 2007. Global climate change, war, and population decline in recent human history. Proceedings of the National Academy of Sciences, 104(49):19214-19219.
Although scientists have warned of possible social perils resulting from climate change, the impacts of long-term climate change on social unrest and population collapse have not been quantitatively investigated. In this study, high-resolution paleo-climatic data have been used to explore at a macroscale the effects of climate change on the outbreak of war and population decline in the preindustrial era. We show that long-term fluctuations of war frequency and population changes followed the cycles of temperature change. Further analyses show that cooling impeded agricultural production, which brought about a series of serious social problems, including price inflation, then successively war outbreak, famine, and population decline successively. The findings suggest that worldwide and synchronistic war-peace, population, and price cycles in recent centuries have been driven mainly by long-term climate change. The findings also imply that social mechanisms that might mitigate the impact of climate change were not significantly effective during the study period. Climate change may thus have played a more important role and imposed a wider ranging effect on human civilization than has so far been suggested. Findings of this research may lend an additional dimension to the classic concepts of Malthusianism and Darwinism.
[109]
Zhao S, Peng C, Jiang H et al., 2006. Land use change in Asia and the ecological consequences. Ecological Research, 21(6):890-896.
[110]
Zhao X, Liu J, Liu Q et al., 2015. Physical and virtual water transfers for regional water stress alleviation in China. Proceedings of the National Academy of Science, 112(4):1031-1035.
Water can be redistributed through, in physical terms, water transfer projects and virtually, embodied water for the production of traded products. Here, we explore whether such water redistributions can help mitigate water stress in China. This study, for the first time to our knowledge, both compiles a full inventory for physical water transfers at a provincial level and maps virtual water flows between Chinese provinces in 2007 and 2030. Our results show that, at the national level, physical water flows because of the major water transfer projects amounted to 4.5% of national water supply, whereas virtual water flows accounted for 35% (varies between 11% and 65% at the provincial level) in 2007. Furthermore, our analysis shows that both physical and virtual water flows do not play a major role in mitigating water stress in the water-receiving regions but exacerbate water stress for the water-exporting regions of China. Future water stress in the main water-exporting provinces is likely to increase further based on our analysis of the historical trajectory of the major governing socioeconomic and technical factors and the full implementation of policy initiatives relating to water use and economic development. Improving water use efficiency is key to mitigating water stress, but the efficiency gains will be largely offset by the water demand increase caused by continued economic development. We conclude that much greater attention needs to be paid to water demand management rather than the current focus on supply-oriented management.
[111]
Zheng S, Yi H, Li H , 2015. The impacts of provincial energy and environmental policies on air pollution control in China. Renewable and Sustainable Energy Reviews, 49:386-394.
[112]
Zimmerer K S, Bassett T J , 2003. Political Ecology: An Integrative Approach to Geography and Environment-development Studies. New York: Guilford Press.

Funding

Program of the National Natural Science Foundation of China(No.41590842)
Program of the National Natural Science Foundation of China(No.41801164)
China Postdoctoral Science Foundation(No.2018M630196)

RIGHTS & PERMISSIONS

Copyright reserved © 2019. Office of Journal of Geographical Sciences All articles published represent the opinions of the authors, and do not reflect the official policy of the Chinese Medical Association or the Editorial Board, unless this is clearly specified.
PDF(4623 KB)
Knowledge map

1990

Accesses

0

Citation

Detail

Sections
Recommended

/