Nature-based solutions for sustainable, resilient, and equitable cities

Nature-based Solutions for Cities brings diverse perspectives from across the globe together to describe the state of the art in advancing nature-based solutions (NBS) for cities. Our goal is to provide a handbook for graduate students, early-career professionals, and emerging and advanced scholars to begin working with NBS in ways that consider multiple perspectives, disciplines, and ways of knowing. Together, the chapters in this book aim at understanding how NBS can be better managed, planned, and engaged with, and to center questions of NBS for whom and for what NBS are planned and implemented in cities. Through chapters led by experts in both global south and north contexts, we describe key knowledge and learning for advancing the interdisciplinary science of NBS in, for, and with cities and discuss the frontiers for next-generation NBS

Parks Under Stress: Air Temperature Regulation of Urban Green Spaces Under Conditions of Drought and Summer Heat

In times of urbanization and climate change, urban green spaces and their ecosystem services are pivotal for adapting to extreme weather events such as heat and drought. But what happens to the provision of ecosystem services when green spaces themselves are compromised by heat and drought? In this study, we assessed the air temperature regulation by two structurally distinct inner-city parks in Leipzig, Germany, that were strongly affected by the heat and drought periods in 2018 and 2019. We used a dense network of in-situ measurements and machine learning to create spatially explicit maps of air temperature distribution at a fine-scale neighborhood level for a 24 h period during the summer heat wave in 2019. The results showed that the larger, tree-dominated park could maintain spaces of relative coolness at any time, whereas the other rather open, grass-dominated park was strongly heated during the daytime but provided relatively cool air during the night and early morning. We found a maximum spatially averaged cooling effect of green spaces versus the built-up surroundings of 1.1°C in the morning. In the afternoon, however, when air temperatures peaked at nearly 40°C, cooling was limited to shaded areas, leading to average differences between green spaces and built-up surroundings below 1°C. Our spatially explicit maps indicated that the “cooling distances” of green spaces, i.e., cooling effects that extend beyond the boundaries of a park, are negligible during dry and hot conditions. We conclude that vegetation structure, particularly the configuration of trees, is key to designing heat and drought-resilient green spaces and thus maintaining ecosystem service provision under the challenges of climate change. Urban planning needs to account for larger green spaces that are complemented by decentralized, well-distributed small-scale green infrastructure that intersperses the built infrastructure such as roadside greenery and vegetated backyards.Peer Reviewe

Towards mainstreaming nature-based solutions for achieving biodiverse, resilient, and inclusive cities

Reconnecting humanity to the biosphere must be a focus in cities. Transforming cities to be inclusive, equitable, resilient, and sustainable requires rethinking our relationship to nature, and investing in urban development, design, and governance that brings nature into the center. We provide seven key insights drawn from the chapters in this book: (1) put nature-based solutions (NBS) first in adaptation to climate change in cities; (2) make equity and justice central in the design, planning, management, and governance of NBS in cities; (3) ensure biodiversity is a priority in urban planning for NBS; (4) employ and design NBS to improve human health in cities; (5) realize NBS in cities with inclusive urban planning and innovative governance approaches that respond to local context dynamics; (6) assess the holistic value of urban nature to make a case for NBS in cities; and (7) bring art into NBS and position art as a NBS in cities

Nature-Based Solutions for Cities

Nature-based solutions (NBS) are increasingly being adopted to address climate change, health, and urban sustainability, yet ensuring they are effective and inclusive remains a challenge. Addressing these challenges through chapters by leading experts in both global south and north contexts, this forward-looking book advances the science of NBS in cities and discusses the frontiers for next-generation urban NBS

Patterns of Urban Green Space Use Applying Social Media Data: A Systematic Literature Review

Scientific interest in the potential of urban green spaces, particularly urban parks, to improve health and well-being is increasing. Traditional research methods such as observations and surveys have recently been complemented by the use of social media data to understand park visitation patterns. We aimed to provide a systematic overview of how social media data have been applied to identify patterns of urban park use, as well as the advantages and limitations of using social media data in the context of urban park studies. We used the PRISMA method to conduct a systematic literature analysis. Our main findings show that the 22 eligible papers reviewed mainly used social media data to analyse urban park visitors’ needs and demands, and to identify essential park attributes, popular activities, and the spatial, social, and ecological coherence between visitors and parks. The review allowed us to identify the advantages and limitations of using social media data in such research. These advantages include a large database, real-time data, and cost and time savings in data generation of social media data. The identified limitations of using social media data include potentially biased information, a lack of socio-demographic data, and privacy settings on social media platforms. Given the identified advantages and limitations of using social media data in researching urban park visitation patterns, we conclude that the use of social media data as supplementary data constitutes a significant advantage. However, we should critically evaluate the possible risk of bias when using social media data.Peer Reviewe

Principles for urban nature-based solutions

Nature-based solutions (NBS) were introduced as integrated, multifunctional and multi-beneficial solutions to a wide array of socio-ecological challenges. Although principles for a common understanding and implementation of NBS were already developed on a landscape scale, specific principles are needed with regard to an application in urban areas. Urban areas come with particular challenges including (i) spatial conflicts with urban system nestedness, (ii) specific urban biodiversity, fragmentation and altered environments, (iii) value plurality, multi-actor interdependencies and environmental injustices, (iv) path-dependencies with cultural and planning legacies and (v) a potential misconception of cities as being artificial landscapes disconnected from nature. Given these challenges, in this perspective paper, we build upon and integrate knowledge from the most recent academic work on NBS in urban areas and introduce five distinct, integrated principles for urban NBS design, planning and implementation. Our five principles should help to transcend governance gaps and advance the scientific discourse of urban NBS towards a more effective and sustainable urban development. To contribute to resilient urban futures, the design, planning, policy and governance of NBS should (1) consider the need for a systemic understanding, (2) contribute to benefiting people and biodiversity, (3) contribute to inclusive solutions for the long-term, (4) consider context conditions and (5) foster communication and learning

Designing a knowledge co-production operating space for urban environmental governance lessons from Rotterdam, Netherlands and Berlin, Germany

Challenges for a sustainable urban development are increasingly important in cities because urbanization and related land take come up with negative challenges for the environment and for city residents. Searching for successful solutions to environmental problems requires combined efforts of different scientific disciplines and an active dialogue between stakeholders from policy and society. In this paper, we present a comparative assessment of the way policy-science dialogues have achieved knowledge co-production about strategic urban environmental governance action using the cities of Berlin in Germany and Rotterdam in the Netherlands as case studies. The ecosystem services framework is applied as a lens for policy-science interaction and a 'knowledge co-production operating space' is introduced. We show how policy officers, urban planners, practitioners and scientists learned from each other, and highlight the impact of this knowledge co-production for governance practice. We found that the concerted collaboration and co-creation between researchers and policy officers have led to mutual learning and establishment of relationships and trust in both cities. Not only the policy-relevance of research and its policy uptake were achieved but also new insights for research blind spots were created. In our conclusions we reflect on co-production processes with two types of conditions that we introduced to be most influential in the way knowledge can be co-created. These are conditions that relate to the way knowledge co-production processes are set-up and, conditions that relate to the expected value or benefit that the co-produced knowledge will bring across society, policy and practice

Nature-based solutions and mental health

This chapter demonstrates the mental health benefits of nature-based solutions in cities. First, factors that determine urban mental health and adverse health effects of environmental stressors in cities are explained. Second, it is demonstrated that green spaces as nature-based solutions for many societal challenges provide co-benefits for mental health by reducing these stressors. It is further discussed how nature-based solutions may target supporting mental health by providing resources for human–nature interaction, enhancing social interaction and strengthening mental resilience. Nature-based interventions that are originally intended to support persons with psychiatric illness are introduced as models for the design of mentally supportive cities. And third, two case studies illustrate the mental health benefits of urban parks with the example of Leipzig, Germany and of street trees by the example of Hyderabad, India. The two case studies were used as application cases for a recent conceptual framework as a guide for putting science into practice

Governance of and with nature-based solutions in cities

This chapter centres on the planning and governance of urban nature-based solutions (NBS). We discuss on the one hand the governance of NBS, where the implementation of NBS is the goal and governance centres around questions of planning, designing, and building NBS, and on the other hand the governance with NBS, where NBS become a governance tool to achieve other goals in urban areas, such as the Sustainable Development Goals. We argue that inclusivity is critical in NBS governance and offer five dimensions of inclusive governance to be considered: cross-sectoral, epistemic, multi-species, intergenerational, and spatial inclusivity. While these dimensions highlight diverse takes on who should be included in NBS governance and how, they share a foundation in two critical principles of inclusive governance that we briefly discuss: intersectionality and inter- and transdisciplinarity

How Are Urban Green Spaces and Residential Development Related? A Synopsis of Multi-Perspective Analyses for Leipzig, Germany

The relationship between urban green spaces (UGS) and residential development is complex: UGS have positive and negative immediate impacts on residents’ well-being, residential location choice, housing, and land markets. Property owners and real estate agents might consider how prospective clients perceive UGS and act accordingly, while urban planners influence UGS location and management as well as aim at steering the built environment. Typically, studies focus on one of these perspectives at a time. Here, we provide a synopsis of results from studies, taking different perspectives for a single case study: Leipzig, Germany. We summarise and discuss the findings of eight studies on UGS and residential development. In detail, these studies focus on spatial pattern analysis, hedonic pricing analysis, mixed-methods studies on experts’ perspectives, surveys, and choice experiments exploring residents’ perceptions of UGS. We reflect on the feasibility of deriving a synthesis out of these independent studies and to what extent context matters. We conclude that both triangulating of data and methods, as well as long-term and context-sensitive studies are needed to explain the interlinkages between UGS and residential development and their context dependency.Peer Reviewe