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The COVID-19 pandemic has required health protection responses with far-reaching consequences for society, livelihoods, and the wider economy. Future enquiries will in time evaluate the success of responses at all scales. But emerging lessons highlight immediate implications for addressing the growing climate crisis through a recovery from COVID-19 that advances population health, economic regeneration and climate action. Cities are where many of the most critical actions for health, greenhouse gas (GHG) emissions reduction, resilience and risk reduction must be taken, supported by national governments, multi-lateral agencies and other stakeholders. Rapid decarbonisation across all sectors of society is needed over this decade—further delay will seriously reduce the possibility of achieving the targets set out in the Paris Agreement. Now is therefore an especially important juncture for cities to act for both the near-term imperatives of the post-COVID recovery and the long-term welfare of their residents and the planet.

Standards for designing, improving, and maintaining the built environment have conceptual and practical value for health. Yet, their importance runs the risk of being subsumed in tangential discour...

Anthropogenic environmental change will heavily impact cities, yet associated health risks will depend significantly on decisions made by urban leaders across a wide range of non-health sectors, including transport, energy, housing, basic urban services, and others. A subset of planetary health researchers focus on understanding the urban health impacts of global environmental change, and how these vary globally and within cities. Such researchers increasingly adopt collaborative transdisciplinary approaches to engage policy-makers, private citizens, and other actors in identifying and evaluating potential policy solutions that will reduce environmental impacts in ways that simultaneously promote health, equity, and/or local economies-in other words, maximising 'co-benefits'. This report presents observations from a participatory workshop focused on challenges and opportunities for urban planetary health research. The workshop, held at the 16th International Conference on Urban Health (ICUH) in Xiamen, China, in November 2019, brought together 49 participants and covered topics related to collaboration, data, and research impact. It featured research projects funded by the Wellcome Trust's Our Planet Our Health (OPOH) programme. This report aims to concisely summarise and disseminate participants' collective contributions to current methodological practice in urban planetary health research.

CITY KNOW-HOWHuman health and planetary health are both influenced by city lifestyles, city leadership, and city development. For both, worrying trends are leading to increasing concern. It is imperative that both become core foci in urban policy. Changing the trajectory will require concerted action. The journal Cities & Health journal is dedicated to supporting the flow of knowledge, in all directions to help make this happen. We want to support communication between researchers, practitioners, policy-makers, communities and decision-makers in cities. This is the purpose of this City Know-how section of the journal. ‘Research for city practice’ disseminates lessons from research, explaining the key messages for city leaders, communities and the professions involved in city policy and practice. ‘City shorts’ provide glimpses of what is being attempted or achieved. ‘Case studies’ are where you will find evaluations of interventions and ‘Commentary and debate’ helps extend the conversations we are having a...

Complexity is the hallmark of our habitats, our livelihoods and our health. These objects of analysis, understanding and intervention extend from our homes to our streets and neighbourhoods...

Background Localisation is a pervasive challenge in achieving sustainable development. Contextual particularities may render generalized strategies to achieve the Sustainable Development Goals (SDGs) unfeasible, impractical, or ineffective. Furthermore, many localities are resource- and data-poor, limiting applicability of the global SDG indicator framework. Tools to enable local actors to make sense of complex problems, communicate this understanding, and act accordingly hold promise in their ability to improve results. Aim Systems approaches can help characterise local causal systems, identify useful leverage points, and foster participation needed to localise and catalyse development action. Critically, such efforts must be deeply rooted in place, involving local actors in mapping decision-processes and causation within local physical, social and policy environments. Given that each place has a unique geographical or spatial extent and therein lies its unique characters and problems, we term these activities “placially explicit.” We describe and reflect on a process used to develop placially explicit, systems-based (PESB) case studies on issues that intersect with and impact urban health and wellbeing, addressing the perspectives of various actors to produce place-based models and insights that are useful for SDG localisation. Methods Seven case studies were co-produced by one or more Partners with place-based knowledge of the case study issue and a Systems Thinker. In each case, joint delineation of an appropriate framing was followed by iterative dialogue cycles to uncover key contextual factors, with attention to institutional and societal structures and paradigms and the motivations and constraints of other actors. Casual loop diagrams (CLDs) were iteratively developed to capture complex narratives in a simple visual way. Results Case study development facilitated transfer of local knowledge and development of systems thinking capacity. Partners reported new insights, including a shifting of problem frames and corresponding solution spaces to higher systems levels. Such changes led partners to re-evaluate their roles and goals, and thence to new actions and strategies. CLD-based narratives also proved useful in ongoing communications. Conclusion Co-production of PESB case studies are a useful component of transdisciplinary toolsets for local SDG implementation, building the capacity of local actors to explore complex problems, identify new solutions and indicators, and understand the systemic linkages inherent in SDG actions across sectors and scales.

The question of how to achieve healthy, sustainable urban futures demands a singular emphasis. The scale and rate of change of modern urbanisation is unprecedented—so much so that it threatens the health gains of the past century. Urbanisation is the greatest ecological shift in human history, and in modern times has attained dimensions never seen before. We have mere decades to enact the greatest transformational change the planet has ever seen, if we are to safeguard a sustainable future. Indeed, the scope, scale, and ambition of transformative efforts need to accelerate dramatically, if humanity is to achieve sustainability before being overwhelmed by global change.

The world is undergoing a massive urban transition, which is now both the greatest driver of global environmental change and the most significant influence on human health. Cities offer real opportunities for improving health, but managed poorly, they can also create or reinforce significant health deficits while putting severe stresses on the natural systems which support human civilization. Management of urban problems is rarely straightforward, as complexity across scales and sectors, in causal structures, actors and incentives, can lead to ineffective policies and unintended consequences. Systems thinking offers a promising way forward in its ability to deal with non-linear relationships and simultaneous actions and outcomes. Encompassing, on the one hand, analytic frameworks and methods that can provide important causal insights and a test bed for urban policy, and on the other, broad processes of inter- and trans-disciplinary engagement to better define problems and feasible solutions, systems approaches are critical to the current and future design and management of sustainable healthy cities.

It has become evident that our planetary ecosystem is changing rapidly in response to human activities. This has led scientists to recognize the present-day era as a new geological epoch, the Anthropocene, in recognition of the substantial effect of man on the Earth’s systems. Human health is better today than at any other time in history. Yet the flourishing of civilization has come at the cost of an unsustainable exploitation of nature’s resources. As we look toward the future, it has become clear that we now face substantial health risks from the degradation of the natural life support systems which is critical for human survival. Global environmental change, including climatic change, ocean acidification, land degradation, water scarcity, overexploitation of fisheries, and biodiversity loss, poses serious challenges to the global health gains of the past several decades.

The term “co-benefits” refers to positive outcomes accruing from a policy beyond the intended outcome, often or usually in other sectors. In the urban context, policies implemented in particular sectors (such as transport, energy or waste) often generate multiple co-benefits in other areas. Such benefits may be related to the reduction of local or global environmental impacts and also extend into the area of public health. A key to identifying and realising co-benefits is the adoption of systems approaches to understand inter-sectoral linkages and, in particular, the translation of this understanding to improved sector-specific and city governance. This paper reviews a range of policies which can yield health and climate co-benefits across different urban sectors and illustrates, through a series of cases, how taking a systems approach can lead to innovations in urban governance which aid the development of healthy and sustainable cities. Resumo “Co-benefícios” é um termo que se refere aos impactos positivos de uma política além do que se era esperado inicialmente. No contexto urbano, políticas executadas em um setor específico (como transporte, energia ou resíduos) frequentemente podem gerar múltiplos co-benefícios em outras áreas, como redução dos impactos ambientais globais e locais, e se extendendo à saúde pública. Um ponto chave para se poder identificar e gerar co-benefícios é adotar a abordagem por sistemas para entender as ligações inter-setoriais. Esta abordagem também pode ajudar no entendimento de como podemos melhorar um setor específico e a governança urbana em geral. Assim, este artigo faz uma revisão da literatura de várias políticas que geram co-benefícios climáticos e de saúde em diversos setores e ilustra através de uma série de casos como a abordagem por sistemas pode levar a inovações em governança urbana que levem ao desenvolvimento de cidades mais sustentaveis e saudáveis. Resumen “Co-beneficios” es un término que se refiere a los impactos positivos de una política que van más allá de los resultados esperados, con frecuencia en sectores distintos. En el contexto urbano, las políticas en determinados sectores (como el transporte, la energía o la gestión de residuos) muchas veces generan co-beneficios múltiples en otros sectores. Entre dichos beneficios se incluye la reducción de los impactos ambientales a nivel local o mundial e incluso en el ámbito de la salud pública. Entre las acciones claves para la identificación y realización de co-beneficios se incluye la adopción de un enfoque sistémico-analítico para entender los vínculos intersectoriales y, en particular, la traducción de este entendimiento en mejor gobernanza a nivel de sectores específicos y municipalidades. Este artículo repasa una serie de políticas que puedan generar co-beneficios para la salud y el clima a través de distintos sectores urbanos. Por medio de casos ejemplares, ilustra cómo un abordaje por sistemas puede producir innovaciones en la gobernanza urbana que faciliten el desarrollo de ciudades sanas y sostenibles.

Extreme events, both natural and anthropogenic, increasingly affect cities in terms of economic losses and impacts on health and well-being. Most people now live in cities, and Asian cities, in particular, are experiencing growth on unprecedented scales. Meanwhile, the economic and health consequences of climate-related events are worsening, a trend projected to continue. Urbanization, climate change and other geophysical and social forces interact with urban systems in ways that give rise to complex and in many cases synergistic relationships. Such effects may be mediated by location, scale, density, or connectivity, and also involve feedbacks and cascading outcomes. In this context, traditional, siloed, reductionist approaches to understanding and dealing with extreme events are unlikely to be adequate. Systems approaches to mitigation, management and response for extreme events offer a more effective way forward. Well-managed urban systems can decrease risk and increase resilience in the face of such events.

SummaryThe genetic structure of Sicily was analysed through the distribution of surnames of 758,793 users registered in the Italian Telephone Company, corresponding to 371 communes of the island. Estimates of the coefficient of consanguinity due to random isonymy, of Fisher'sa, an indicator of abundance of surnames, and of Karlin–McGregor'sv, an indicator of immigration rates, were obtained for each commune. Four different estimates of genetic distance between all possible pairs of communes within each province were also obtained, and their relationship with geographic distance was studied. The logarithmic transformation of Lasker's coefficient of relationship showed correlations with the log of geographic distance which range between −0·78 and −0·40; the strongest, for the province of Catania, was attributed to the presence of Mount Etna, and the weakest, for Palermo, to the high population density of this province.

Background As human populations become more and more urban, decision-makers at all levels face new challenges related to both the scale of service provision and the increasing complexity of cities and the networks that connect them. These challenges may take on unique aspects in cities with different cultures, political and institutional frameworks, and at different levels of development, but they frequently have in common an origin in the interaction of human and environmental systems and the feedback relationships that govern their dynamic evolution. Accordingly, systems approaches are becoming recognized as critical to understanding and addressing such complex problems, including those related to human health and wellbeing. Management of water resources in and for cities is one area where such approaches hold real promise. Results This paper seeks to summarize links between water and health in cities and outline four main elements of systems approaches: analytic methods to deal with complexity, interdisciplinarity, transdisciplinarity, and multi-scale thinking. Using case studies from a range of urban socioeconomic and regional contexts (Maputo, Mozambique; Surat and Kolkata, India; and Vienna, Austria). Conclusion We show how the inclusion of these elements can lead to better research design, more effective policy and better outcomes. Electronic supplementary material The online version of this article (doi:10.1186/s12940-016-0107-2) contains supplementary material, which is available to authorized users.