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Motivated by the need for cities to prepare for and adapt to climate change, we advance the paradigm of safe‐to‐fail by focusing on the decision dilemmas and the consideration of infrastructure failure consequences in developing infrastructure. Infrastructures are largely designed as fail‐safe; that is, they are not intended to fail, and when failure happens, the consequences are severe. Safe‐to‐fail has been recently presented as the antithesis of fail‐safe, without any specific guidance of what the paradigm is or how to apply it. There is an emerging need for stakeholders, including policy makers, planners, engineers, utilities, and communities to understand infrastructure failures, bring their knowledge into the infrastructure development process, and help adapt cities to unpredictable and changing climate risks. We frame safe‐to‐fail as an infrastructure development paradigm that internalizes the consequences of infrastructure failure in the development process. This framing of safe‐to‐fail further reveals an emerging “infrastructure trolley problem” where the adaptive capacity of some regions is improved at the expense of others. We demonstrate practical dilemmas in developing infrastructure under nonstationary climate and guide managing trade‐offs in the prioritization of different consequences of infrastructure failure.

In our paper “Coupled Human and Natural Systems” (Liu et al. 2007), we developed a timely, theoretical, and practical foundation for research on Coupled Human And Natural Systems (CHANS). The science of CHANS builds upon, but goes beyond previous research that linked humans and ecosystems (e.g., ecological anthropology, environmental geography, human ecology). CHANS science uses a holistic perspective to integrate patterns and processes that connect human and natural systems, as well as within-scale and cross-scale interactions and feedbacks between human and natural components of such systems (Fig. 1). Such an integrated framework is needed to understand the increased complexity of the Anthropocene and develop innovative solutions to unprecedented global challenges. Open in a separate window Fig. 1 A schematic diagram of a coupled human and natural system. Arrows show interactions and feedbacks. (courtesy of Vanessa Hull.)

Many cities aim to progress toward their sustainability and public health goals by increasing use of their public transit systems. However, without adequate protective infrastructure that provides thermally comfortable conditions for public transit riders, it can be challenging to reach these goals in hot climates. We took micrometeorological measurements and surveyed riders about their perceptions of heat and heat-coping behaviors at bus stops with a variety of design attributes in Phoenix, AZ, USA, during the summer of 2018. We identified the design attributes and coping behaviors that made riders feel cooler. We observed that current infrastructure standards and material choices for bus stops in Phoenix are insufficient to provide thermal comfort, and can even expose riders to health risks. Almost half of the study participants felt hot or very hot at the time they were surveyed, and more than half reported feeling thermally uncomfortable. On average, shade reduced the physiological equivalent temperature (PET) by 19 °C. Moreover, we found significant diurnal differences in PET reductions from the shade provided by various design attributes. For instance, all design attributes were effective in reducing PET in the morning; however, a vegetated awning did not provide statistically significant shade reductions in the afternoon. Temperatures of sun-exposed surfaces of man-made materials exceeded skin burn thresholds in the afternoon, but shade was effective in bringing the same surfaces to safe levels. Aesthetically pleasing stops were rated as cooler than stops rated as less beautiful. We conclude that cities striving to increase public transit use should prioritize thermal comfort when designing public transit stops in hot climates.

Designing cities for thermal comfort should be a priority in the warming and urbanizing world. As cities continue to break extreme heat records, it is necessary to develop new sensing approaches capable of tracking thermal sensations of actual users of urban spaces. The Influence of built infrastructure on the microclimate at a human scale and residents’ thermal sensations is not well explored, but combining sensing techniques with simultaneous collection of user experiences is a promising research direction to shorten the gap.We explored the relationships between the built environment, heat perception, and behavioral coping mechanisms in one of the most heat vulnerable Phoenix neighborhoods. Using Phoenix as an example, where extreme summer temperatures are a norm, can help to address heat challenges of other cities that have started facing temperature extremes in the recent years.This study is an experimental citizen science project in which participants helped to create a “heat map” of the neighborhood. Participants were engaged in a 1-hour walk around the neighborhood and recorded their experience in a field guide. A smaller group participated in walking interviews and wore GPS devices and UV meters to gain deeper insights on subjective heat perception and physical body heat accumulation during the walk. Results revealed the differences in heat perception across a variety of urban landscapes. Participants identified preferred and most challenging locations, and gave ideas on what could improve their experience. Combined heart rate, UV exposure and microclimate data mapped in GIS visualized dependencies between the streetscape and physiological conditions of the study participants.This project is one of the first to examine the impact of urban environment on dynamic psychological and physiological responses to heat. Using sensing techniques and qualitative research instruments, this research will inform the design changes in the neighborhood that will undergo redevelopment. It can serve as an example for other cities striving to adapt urban microclimates to new extremes.

In many disciplines, the resilience concept has applied to managing perturbations, challenges, or shocks in the system and designing an adaptive system. In particular, resilient infrastructure systems have been recognized as an alternative to traditional infrastructure, in which the systems are managed to be more reliable against unforeseen and unknown threats in urban areas. Perhaps owing to the malleable and multidisciplinary nature in the concept of resilience, there is no clear-cut standard that measures and characterizes infrastructure resilience nor how to implement the concept in practice for developing urban infrastructure systems. As a result, unavoidable subjective interpretation of the concept by practitioners and decision-makers occurs in the real world. We demonstrate the subjective perspectives on infrastructure resilience by asking practitioners working in governmental institutions within the metropolitan Phoenix area based on their interpretations of resilience, using Q-methodology. We asked practitioners to prioritize 19 key strategies for infrastructure resilience found in literature in three different decision contexts and recognized six discourses by analyzing the shared or discrete views of the practitioners. We conclude that, from the diverse perspectives on infrastructure resilience observed in this study, practitioners’ interpretation of resilience adds value to theoretical resilience concepts found in the literature by revealing why and how different resilience strategies are preferred and applied in practice.

Urban areas—their inhabitants and their infrastructure—are often concentrated in exposed areas like coasts and drylands and thus vulnerable to extreme events. Climate change is driving increasing frequency and magnitude of such events, such that risk to people and infrastructure in cities is one of the prime manifestations of the interaction between these two major components of global change. As a result of this accelerating risk, there is increased awareness of and interest in the concept of resilience among city practitioners and urban scholars alike. We present a conceptual framework for urban social-ecological-technological systems (SETS) that integrates three domains: social/equity/governance, environmental/ecological, and engineering/built environment/technology issues. We assert that socioecological systems and socially sensitive engineering approaches that fail to incorporate the third dimension may reduce resilience to climate-related disaster. The Urban Resilience to Extremes Sustainability Research Network is exploring: 1) potential solutions such as green infrastructure and safe-to-fail design, 2) modifications of ecosystem services approaches and vulnerability and resilience assessment under a SETS framing, and 3) participatory visioning of sustainable, resilient futures to guide urban transformation. A SETS approach enriches these activities through sensible balancing of the three domains, evaluating tradeoffs among them and opportunities for emergence that can support transformation. The infrastructure of the future must leverage ecosystem services, improve social well being, and exploit new technologies in ways that benefit all segments of urban populations and are context specific. Contexts are defined not only by the biophysical environment but also by culture and institutions of each place. The SETS conceptual framework is being applied in ten diverse western hemisphere cities to co-develop, with city practitioners, visions of resilient SETS infrastructure for an uncertain future.

Infrastructure development is central to the processes that abate and produce vulnerabilities in cities. Urban actors, especially those with power and authority, perceive and interpret vulnerability and decide when and how to adapt. When city managers use infrastructure to reduce urban risk in the complex, interconnected city system, new fragilities are introduced because of inherent system feedbacks. We trace the interactions between system dynamics and decision-making processes over 700 years of Mexico City's adaptations to water risks, focusing on the decision cycles of public infrastructure providers (in this case, government authorities). We bring together two lenses in examining this history: robustness-vulnerability trade-offs to explain the evolution of systemic risk dynamics mediated by feedback control, and adaptation pathways to focus on the evolution of decision cycles that motivate significant infrastructure investments. Drawing from historical accounts, archeological evidence, and original research on water, engineering, and cultural history, we examine adaptation pathways of humans settlement, water supply, and flood risk. Mexico City's history reveals insights that expand the theory of coupled infrastructure and lessons salient to contemporary urban risk management: (1) adapting by spatially externalizing risks can backfire: as cities expand, such risks become endogenous; (2) over time, adaptation pathways initiated to address specific risks may begin to intersect, creating complex trade-offs in risk management; and (3) city authorities are agents of risk production: even in the face of new exogenous risks (climate change), acknowledging and managing risks produced endogenously may prove more adaptive. History demonstrates that the very best solutions today may present critical challenges for tomorrow, and that collectively people have far more agency in and influence over the complex systems we live in than is often acknowledged.

The emerging academic field focused on sustainability has been engaged in a rich and converging debate to define what key competencies are considered critical for graduating students to possess. For more than a decade, sustainability courses have been developed and taught in higher education, yet comprehensive academic programs in sustainability, on the undergraduate and graduate level, have emerged only over the last few years. Considering this recent institutional momentum, the time is seemingly right to synthesize the discussion about key competencies in sustainability in order to support these relatively young academic programs in shaping their profiles and achieving their ambitious missions. This article presents the results of a broad literature review. The review identifies the relevant literature on key competencies in sustainability; synthesizes the substantive contributions in a coherent framework of sustainability research and problem-solving competence; and addresses critical gaps in the conceptualization of key competencies in sustainability. Insights from this study lay the groundwork for institutional advancements in designing and revising academic programs; teaching and learning evaluations; as well as hiring and training faculty and staff.

PurposeThe purpose of this paper is to argue that the types of and ways in which academic institutions produce knowledge are insufficient to contribute to a transition to sustainability.Design/methodology/approachReflecting on experiences at the School of Sustainability, the authors contend that a different kind of knowledge is needed, what we call sustainability knowledge. A conceptual approach is taken wherein the authors propose several characteristics of sustainability knowledge and offer some proposals on how academic institutions must be structured to produce it.FindingsSustainability knowledge has several characteristics including social robustness, recognition of system complexity and uncertainty, acknowledgement of multiple ways of knowing and the incorporation of normative and ethical premises. In order to produce sustainability knowledge, the knowledge production process itself must be changed to be more adaptive and engaged with society. Two organizing characteristics for institutions seeking to produce such knowledge are proposed – epistemological pluralism and reflexivity. The adaptive cycle from resilience theory is then used as a heuristic to illustrate how these design characteristics play out in making the institution (and individual) more adaptive.Practical implicationsAs more academic institutions move to address sustainability, this paper does not offer a roadmap; rather, it raises important issues that must be addressed in performing research and education for sustainability.Originality/valueThe paper shows that type of knowledge that academia must produce and how it might produce it are redefined for sustainability problems.

William J. McConnell, James D. A. Millington, Nicholas J. Reo, Marina Alberti, Heidi Asbjornsen, Lawrence A. Baker, Nicholas Brozov, Laurie E. Drinkwater, Scott A. Drzyzga, Jose, Fragoso, Daniel S. Holland, Claire A. Jantz, Timothy Kohler, Herbert D. G. Maschner, Michael Monticino, Guillermo Podesta, Robert Gilmore Pontius, Jr., Charles L. Redman, David Sailor, Gerald Urquhart, and Jianguo Liu. (2011). Research on Coupled Human and Natural Systems (CHANS): Approach, Challenges, and Strategies. Bulletin of the Ecological Society of America April: 218-228.

Sustainability problem constellations related to sea-level rise, desertification, poverty, lack of education, pandemics, or military conflicts result from complex, dynamic cause–effect chains. Elem...

Urbanization is the most drastic form of land use change affecting biodiversity and ecosystem functioning and services far beyond the limits of cities. To understand the process of urbanization itself as well as its ecological consequences, it is important to quantify the spatiotemporal patterns of urbanization. Based on historical land use data, we characterize the temporal patterns of Phoenix and Las Vegas – the two fastest growing metropolitan regions in the United States – using landscape pattern metrics at multiple spatial resolutions. Our results showed that the two urban landscapes exhibited strikingly similar temporal patterns of urbanization. During the past several decades, urbanization in the two desert cities resulted in an increasingly faster increase in the patch density, edge density, and structural complexity at both levels of urban land use and the entire landscape. That is, as urbanization continued to unfold, both landscapes became increasingly more diverse in land use, more fragmented in structure, and more complex in shape. The high degree of similarity between the two metropolitan regions may be attributable to their resemblance in the natural environment, the form of population growth, and the stage of urban development. While our results corroborated some theoretical predictions in the literature, they also showed spatiotemporal signatures of urbanization that were different from other cities. Resolving these differences can certainly further our understanding of urban dynamics. Finally, this study suggests that a small set of landscape metrics is able to capture the main spatiotemporal signatures of urbanization, and that the general patterns of urbanization do not seem to be significantly affected by changing grain sizes of land use maps when the spatial extent is fixed. This landscape pattern analysis approach is not only effective for quantifying urbanization patterns, but also for evaluating spatial urban models and investigating ecological effects of urbanization.

PurposeAcademic sustainability programs aim to develop key competencies in sustainability, including problem‐solving skills and the ability to collaborate successfully with experts and stakeholders. These key competencies may be most fully developed in new teaching and learning situations. The purpose of this paper is to analyze the kind of, and extent to which, these key competencies can be acquired in real‐world learning opportunities.Design/methodology/approachThe paper summarizes key competencies in sustainability, identifies criteria for real‐world learning opportunities in sustainability programs, and draws on dominant real‐world learning models including project‐ and problem‐based learning, service learning, and internships in communities, businesses, and governments. These components are integrated into a framework to design real‐world learning opportunities.FindingsA “functional and progressive” model of real‐world learning opportunities seems most conducive to introduce students (as well as faculty and community partners) to collaborative research between academic researchers and practitioners. The stepwise process combined with additional principles allows building competencies such as problem solving, linking knowledge to action, and collaborative work, while applying concepts and methods from the field of sustainability.Practical implicationsThe paper offers examples of real‐world learning opportunities at the School of Sustainability at Arizona State University, discusses general challenges of implementation and organizational learning, and draws attention to critical success factors such as collaborative design, coordination, and integration in general introductory courses for undergraduate students.Originality/valueThe paper contributes to sustainability education by clarifying how real‐world learning opportunities contribute to the acquisition of key competencies in sustainability. It proposes a functional and progressive model to be integrated into the (undergraduate) curriculum and suggests strategies for its implementation.

The International Long-Term Ecological Research (ILTER) network comprises > 600 scientific groups conducting site-based research within 40 countries. Its mission includes improving the understanding of global ecosystems and informs solutions to current and future environmental problems at the global scales. The ILTER network covers a wide range of social-ecological conditions and is aligned with the Programme on Ecosystem Change and Society (PECS) goals and approach. Our aim is to examine and develop the conceptual basis for proposed collaboration between ILTER and PECS. We describe how a coordinated effort of several contrasting LTER site-based research groups contributes to the understanding of how policies and technologies drive either toward or away from the sustainable delivery of ecosystem services. This effort is based on three tenets: transdisciplinary research; cross-scale interactions and subsequent dynamics; and an ecological stewardship orientation. The overarching goal is to design management practices taking into account trade-offs between using and conserving ecosystems toward more sustainable solutions. To that end, we propose a conceptual approach linking ecosystem integrity, ecosystem services, and stakeholder well-being, and as a way to analyze trade-offs among ecosystem services inherent in diverse management options. We also outline our methodological approach that includes: (i) monitoring and synthesis activities following spatial and temporal trends and changes on each site and by documenting cross-scale interactions; (ii) developing analytical tools for integration; (iii) promoting trans-site comparison; and (iv) developing conceptual tools to design adequate policies and management interventions to deal with trade-offs. Finally, we highlight the heterogeneity in the social-ecological setting encountered in a subset of 15 ILTER sites. These study cases are diverse enough to provide a broad cross-section of contrasting ecosystems with different policy and management drivers of ecosystem conversion; distinct trends of biodiversity change; different stakeholders' preferences for ecosystem services; and diverse components of well-being issues.

Humans have continuously interacted with natural systems, resulting in the formation and development of coupled human and natural systems (CHANS). Recent studies reveal the complexity of organizational, spatial, and temporal couplings of CHANS. These couplings have evolved from direct to more indirect interactions, from adjacent to more distant linkages, from local to global scales, and from simple to complex patterns and processes. Untangling complexities, such as reciprocal effects and emergent properties, can lead to novel scientific discoveries and is essential to developing effective policies for ecological and socioeconomic sustainability. Opportunities for truly integrating various disciplines are emerging to address fundamental questions about CHANS and meet society's unprecedented challenges.

Natural resource management agencies and governmental programs that fund research are increasingly calling for interdisciplinary research that integrates biological ecology and the social sciences in a way that can inform policy. One fundamental impediment to collaboration derives from the emphasis that biological scientists place on experimentation, which is generally not considered a viable option for anthropologists. We suggest that anthropologists could have additional influence on policy by collaborating with biological ecologists in manipulative experiments that include human subjects. Critical to this approach are the participation of research subjects in research planning and willingness on the part of social and biological scientists to rapidly adopt new hypotheses and control scenarios that may emerge from shifting political and ethical contexts—what we call "adaptive experimentation." We provide an example of an adaptive experiment being conducted at Arizona State University, which situates urb...

This article explores the dimensions of rapid urbanization in the Phoenix Standard Metropolitan Statistical Area (SMSA) over the past thirty years with respect to land use change. We devote primary attention to developing an understanding of what land transformations took place, the extent to which they occurred, and where they occurred. Our findings indicate that 32 percent of the Phoenix SMSA changed between 1970 and 2000. More than half of the overall change was from agriculture to some form of urban land use, and although a large percentage of the region remains open desert the parcels of desert are increasingly fragmented. This has significant implications for urban ecology and biodiversity. The growth indicates that rather than a pattern that reflects the agglomeration effects of a polycentric metropolis, the central business district of the City of Phoenix dominates the region. This has implications with respect to employment patterns, traffic congestion, and urban air quality and climate.

Today’s worldwide expansion of dry land cities consumes cultivated and native ecosystems, providing laboratories for investigating imprints of former land use in places where people now live. Around Phoenix, USA, we compared soil nutrient pools in residential yards converted from farms with nutrient pools in yards developed on native desert. Organic matter, carbon (C), nitrogen (N), and soluble ions were 42-fold greater in yards that were previously agrarian than in yards that were not. These pools remain elevated 40 years after land conversion to residential use. Present N accumulation (1.5gm � 2 yr � 1 ) is not affected by prior land use, suggesting that rates of residential fertilizer application and retention are not affected by antecedent soil fertility. Bioavailable, inorganic phosphorus (Pav) is elevated in soil with a recent agrarian past, but this signal disappears after 10–30 years of residential use owing to an accumulation of Pav in never-farmed yards. Our results indicate a ‘direct agrarian legacy,’ wherein agrarian amendment of nutrient pools endures urbanization, more so than an ‘indirect legacy,’ wherein present land management is molded by former land use. Agriculture in dry lands thus sequesters material in soils, and—as we also found higher material contents in residential soils than in contemporary agrarian soils—residential land use simply adds to the agrarian legacy these soils already bear. Intense human use of arid lands may cause increases in material pools in soils, a condition with potential global consequence.

We examined how growth of the Phoenix urban landscape has changed spatial patterns in native Sonoran desert plant diversity. Combining data from the U.S. Census with a probability-based field inventory, we used spatial and multivariate statistics to show how plant diversity across the region is influenced by human actions. Spatial variations in plant diversity among sites were best explained by current and former land use, income, housing age, and elevation. Despite similar average diversity in perennial plant genera between desert and urban sites, numerous imported exotics have significantly increased variation in plant generic composition among urban sites, with a “luxury effect” of higher plant diversity at sites in wealthier neighborhoods. We conclude that controls on natural spatially autocorrelated desert plant diversity are replaced by a variable suite of site-specific human factors and legacy effects, which require an integration of ecology and social science to be fully understood.

This article was originally written as the background paper for a cyberseminar held from 29 November–15 December 2004 under the auspices of Population-Environment Research Network or PERN a joint activity of the International Union for the Scientific Study of Population (IUSSP) and the International Human Dimensions Programme (IHDP) on Global Environmental Change. Originally posted online at the PERN website it has been revised and updated to take into account contributions of participants in the cyberseminar. The article focuses upon the environmental social and health dimensions of urban expansion. Our goal is to compare and contrast the processes of urban expansion and transformation in developing and developed countries. We expect a research agenda to emerge that will foster understanding of the processes contexts and outcomes of urbanization as well as the understanding that will ultimately contribute to policy solutions. Our article benefits from and hopefully will contribute to parallel projects being developed by IHDP Urbanization Science Project the IUSSP Urbanizations and Health Working Group the U.S. National Academies’ Panel on Urban Population Dynamics the U.S. National Academies’ Roundtable on Science and Technology for Sustainability’s Task Force on Rapid Urbanization The Millennium Ecosystem Assessment the World Bank’s Cities Alliance and Cities in Transition and other initiatives that recognize the importance of examining the urban transformation we are experiencing in a comprehensive integrated manner. (excerpt)

The past can be characterized by periods of changing and stable relationships between human groups and their environment. In this article, I argue that use of “resilience theory” as a conceptual framework will assist archaeologists in interpreting the past in ways that are interesting and potentially relevant to contemporary issues. Many of the authors in this “In Focus” section primarily concentrate on the relationships associated with patterns of human extraction of resources and the impacts of those human activities on the continuing condition of the ecosystem. These processes are, of course, embedded in a complex web of relationships that are based on multiple interactions of underlying patterns and processes of both the ecological and social domains. In this article, I introduce a resilience theory perspective to argue that these transformations were characterized by very different reorganizations of the socioecological landscape and were the product of a variety of factors that operated at different scales of geography, time, and social organization.

Scientists develop conceptual frameworks in an effort to better understand and manage the world around them. The dominant framework for most authors in this book and others concerned with Earth Stewardship is a coupled human-natural systems framework. This framework continues to provide new insights and promising management strategies. However, we argue that the addition of a third major domain, infrastructure/technology would more accurately reflect the key dynamics in today’s world and allow more sustainable outcomes. Further we argue that scientists associated with each of these domains adhere to overlapping, but distinct sets of rules and fundamental assumptions that inhibit successful interdisciplinary collaboration. Rectifying this misalignment should be a cornerstone of future Earth Stewardship.

Changing patterns of university and government research and training in this country and abroad force us, as archaeologists, to regularly reevaluate our disciplinary methods and goals. In the absence of careful consideration of these issues, the relative prominence of archaeology may stagnate or even diminish. From our own experience directing large multidisciplinary research projects, we believe that one particularly productive avenue for future archaeological research will be as collaborators in seeking to better understand contemporary socioenvironmental problems. We argue that current environmental research based in life, earth, and social sciences pays inadequate attention to the long time span and slow-moving processes that often underlie environmental crises. Archaeologists, as purveyors of the past, are well equipped to bring this long-term perspective to bear on contemporary issues. Moreover, we are also trained to work in multiple scales of time and space as well as with scientists from various disciplines. The primary obstacles to achieving the type of transdisciplinary research recommended here emanate from distinct vocabulary, concepts, and practices of each disciplinary tradition. We believe that the time is right and our colleagues are willing to see an enhanced role for archaeologists in the study of contemporary environmental issues.

We are entering a new urban era in which the ecology of the planet as a whole is increasingly influenced by human activities (Ellis 2011; Steffen et al. 2011a, b; Folke et al. 2011). Cities have become a central nexus of the relationship between people and nature, both as crucial centres of demand of ecosystem services, and as sources of environmental impacts. Approximately 60 % of the urban land present in 2030 is forecast to be built in the period 2000–2030 (Chap. 21). Urbanization therefore presents challenges but also opportunities. In the next two to three decades, we have unprecedented chances to vastly improve global sustainability through designing systems for increased resource efficiency, as well as through exploring how cities can be responsible stewards of biodiversity and ecosystem services, both within and beyond city boundaries.

In this chapter, we explore the historical dimension of urbanization and why the ecology of urbanization has, until recently, been missing. We discuss the consequences of this for our perceptions of urbanization throughout history and also discuss the emerging reintroduction of ecology and the concept of natural capital into the global discourse on urbanization and sustainability. Humans and the institutions they devise for their governance are often successful at self-organizing to promote their survival in the face of virtually any environment challenge. However, from history we learn that there may often be unanticipated costs to many of these solutions with long-term implications on future societies. For example, increased specialization has led to increased surplus of food and made continuing urban growth possible. But an increased urban - rural disconnection has also led to an alienation of food production from the carrying capacity of the land. While connections and feedbacks with the hinterland that supported growing urban centres were often apparent in the past, this has increasingly been lost in a globalized world. The neglect of a social-ecological perspective and the current disconnect between the urban and the rural risks mean that important feedback mechanisms remain invisible, misinforming policy and action with large consequences for global sustainability. We argue that through reintroducing the social-ecological perspective and the concept of natural capital it is possible to contribute to a redefinition of urban sustainability through making invisible feedbacks and connections visible.

Cities are complex socio-ecological systems (SES). They are focal points of human population, production, and consumption, including the generation of waste and most of the critical emissions to the atmosphere. But they also are centres of human creative activities, and in that capacity may provide platforms for the transition to a more sustainable world. Urban sustainability will require understanding grounded in a theory that incorporates reciprocal, dynamic interactions between societal and ecological components, external driving forces and their impacts, and a multiscalar perspective. In this chapter, we use research from the Central Arizona–Phoenix LTER programme to illustrate how such a conceptual framework can enrich our understanding and lead to surprising conclusions that might not have been reached without the integration inherent in the SES approach. By reviewing research in the broad areas of urban land change, climate, water, biogeochemistry, biodiversity, and organismal interactions, we explore the dynamics of coupled human and ecological systems within an urban SES in arid North America, and discuss what these interactions imply about sustainability.

We are in the early stages of a fundamental and globally pervasive transformation in the interactions of humans, their institutions, the technologies they have created, and the environment that provides both the home and the resources that make it all possible. In this new world, change is to be expected and desired as much or more than stability and this change will often be nonlinear, complex, and hard to predict with the tools we have at hand. Just as we may be frustrated in our attempts to predict the future we, as a global society, have been largely disappointed by the results of our concerted and enduring efforts to solve some of the major challenges already facing us. Continuing war, poverty, pollution, hunger, disease, social injustice, loss of biodiversity, and anthropogenic climate change have not been resolved despite decades of massive effort by the best minds, with enormous resources, and by well-intended nations. New ideas, new tools, new institutions, and new technologies must be part of any emerging solution. For it to succeed we also need a cultural transformation in the way we think, the way we interact, and the way we value the world. It will require that people have a respect for the environment and the services it provides; a respect for others – those we don’t know as well as those we know; a willingness to take responsibility for our actions and inaction; and a determination to make diffi cult decisions in order to underwrite a better future. Taken together this is what many of us mean when we suggest that “sustainability” should be the goal of our efforts in education and in the broader society.