Nature-based solutions as nodes of green-blue infrastructure networks : a cross-scale, co-creation approach

Unidad de excelencia María de Maeztu CEX2019-000940-MThis research was funded through the Spanish Ministry of Economy and Competitiveness.While nature-based solutions have become foundational to sustainable urban and landscape planning schemes at multiple landscape scales, there is a risk that previous progress in green-blue infrastructure planning will be reversed as cross-scale integration increases single- and small-scale focus on nature-based solutions which, in turn, impacts flows of ecosystem services. Considering successful applications of green-blue infrastructure in fostering cross-scale planning visions, we suggest here to conceptualize nature-based solutions as nodes in green-blue infrastructure networks in order to strengthen cross-scale considerations and improve ecosystem services. Addressing the three-tiered and nested regional, metropolitan and city scales of Barcelona, Spain, we apply a deliberative co-creation process to define nature-based solution priorities across landscape scales. Together with local stakeholders, we first prioritize nature-based solutions intervention areas by means of participatory mapping. Secondly, we use a deliberative valuation approach to define ecosystem service priorities for nature-based solution planning. Our findings indicate strong difference in ecosystem service priorities at different scales which underpin the need for a stronger cross-scale spatial integration of planning goals addressed through nature-based solutions. We conclude that the transferability of ecosystem service and trade-offs between ecosystem services require stronger consideration in nature-based solution research and planning for which we base our study, arguing that a stronger integration of nature-based solutions into nested green and blue infrastructure planning would be a promising way forward in urban and landscape planning

Plural relational green space values for whom, when, and where? - A social media approach

Unidad de excelencia María de Maeztu CEX2019-000940-MThe values people ascribe to their interactions with and within the environment are essential to inform justice and sustainability transformations. The development of many of these values unfolds through enjoying so-called cultural ecosystem services (CES) such as outdoor recreation, landscape aesthetics or environmental education. A growing body of literature is improving the assessment of the multiple ways that people value human and non-human relations arising when enjoying CES. Yet, the geo-temporal-demographic patterns of values distribution and the lessons that can be derived are to be consistently analysed within this relational framework. Building on a visual and textual content analysis of social media (SM) data geotagged in a peri-urban park of Barcelona, Spain, this research explores the potential of analysing the associated metadata (such as geotag, timestamp and social media users' demographics - i.e., performed gender and residency) in order to develop a better understanding of the linkages between people's values and the situated context of their construction. Our results show trends in relational CES values distribution along and between the analysed spatial, temporal, and demographic dimensions. In particular, despite there being a multiplicity of values revealed across the whole case-study area, to enjoy contemplative CES, such as spiritual or cognitive value, people need to move away from highly frequented areas and prefer specific times of the day, respectively evening or afternoon. Locals show a higher preference to visit the park on weekends compared to non-locals, while women-performing users show a significantly higher drop in their CES benefits uptake compared to men-performing users at night. In addition to providing novel and fine-grained information for transformative practices toward justice and sustainability, this study highlights the importance of complementing CES studies employing SM with metadata analysis to improve our understanding of the relationship between the real and the more-than-real

Urban agriculture - A necessary pathway towards urban resilience and global sustainability?

Unidad de excelencia María de Maeztu CEX2019-000940-MThe Covid-19 pandemic newly brings food resilience in cities to our attention and the need to question the desired degree of food self-sufficiency through urban agriculture. While these questions are by no means new and periodically entering the global research focus and policy discussions during periods of crises - the last time during the global financial crisis and resulting food price increases in 2008 - urban and peri-urban agriculture continue to be replaced by land-uses rendering higher market values (e.g. housing, transport, leisure). The loss of priority for urban agriculture in urban land-use planning is a global trend with only a few exceptions. We argue in this essay that this development has widely taken place due to three blind spots in urban planning. First, the limited consideration of social and ecological vulnerabilities and risk-related inequalities of urban inhabitants, food shortage among them, in the face of different scenarios of global change, including climate change or pandemic events such as Covid-19. Second, the disregard of the intensified negative environmental (and related social) externalities caused by distant agricultural production, as well as lacking consideration of nutrient recycling potentials in cities (e.g. from wastewater) to replace emission intensive mineral fertilizer use. Third, the lack of accounting for the multifunctionality of urban agriculture and the multiple benefits it provides beyond the provision of food, including social benefits and insurance values, for instance the maintenance of cultural heritage and agro-biodiversity. Along these lines, we argue that existing and new knowledge about urban risks and vulnerabilities, the spatially explicit urban metabolism (e.g. energy, water, nutrients), as well as ecosystem services need to be stronger and jointly considered in land-use decision-making

Using crowdsourced imagery to assess cultural ecosystem services in data-scarce urban contexts : The case of the metropolitan area of Cali, Colombia

Acord transformatiu CRUE-CSICUnidad de excelencia María de Maeztu CEX2019-000940-MSustainable urban and metropolitan planning is increasingly benefiting from differentiated assessments of ecosystem services. Cultural ecosystem services (CES) are particularly relevant for urban residents' mental and physical health, yet, quantification and mapping of CES are often challenging, especially so in the Global South. The use of social media data (SMD), which has recently gained importance for assessing CES at larger spatial and temporal scales, provides a promising entry point for mitigating this informational gap in land-use planning. However, its application is mainly limited to European and North American cases and rarely applied to data-scarce urban regions in the Global South, with South America as no exception. Addressing this geographical gap, this study assesses CES of urban green spaces in the city of Cali, Colombia, based on 1,686 crowdsourced and geolocated photographs, and compares those results with a metropolitan scale CES potential assessment based on expert opinions performed in a previous study. Despite some important limitations primarily related to Flickr as a data source, we demonstrate the utility of this approach, especially for understanding the fine-scale generation of CES by small green spaces located within the urban fabric that are overlooked in the metropolitan scale expert-based assessment. These green spaces are highly relevant as inner-city pockets for CES production, especially in the form of "existence value" and "aesthetic experiences", in contrast to green areas highlighted by experts at the metropolitan scale that serve primarily recreational purposes. Our results indicate the large potential of SMD-based CES assessment approaches for informing urban planning processes in the Global South

A tag is worth a thousand pictures : A framework for an empirically grounded typology of relational values through social media

Unidad de excelencia María de Maeztu CEX2019-000940-MEnvironmental values depend on social-ecological interactions and, in turn, influence the production of the underlying biophysical ecosystems. Understanding the nuanced nature of the values that humans ascribe to the environment is thus a key frontier for environmental science and planning. The development of many of these values depends on social-ecological interactions, such as outdoor recreation, landscape aesthetic appreciation or educational experiences with and within nature that can be articulated through the framework of cultural ecosystem services (CES). However, the non-material and intangible nature of CES has challenged previous attempts to assess the multiple and subjective values that people attach to them. In particular, this study focuses on assessing relational values ascribed to CES, here defined as values resonating with core principles of justice, reciprocity, care, and responsibility towards humans and more-than-humans. Building on emerging approaches for inferring relational CES values through social media (SM) images, this research explores the additional potential of a combined analysis of both the visual and textual content of SM data. To do so, we developed an inductive, empirically grounded coding protocol as well as a values typology that could be iteratively tested and verified by three different researchers to improve the consistency and replicability of the assessment. As a case study, we collected images and texts shared on the photo-sharing platform Flickr between 2004 and 2017 that were geotagged within the peri-urban park of Collserola, at the outskirts of Barcelona, Spain. Results reveal a wide spectrum of nine CES values within the park boundaries that show positive and negative correlations among each other, providing useful information for landscape planning and management. Moreover, the study highlights the need for spatial, temporal and demographic analysis, as well as for supervised machine learning techniques to further leverage SM data into contextual and just decision-making and planning

Adaptive resilience of and through urban ecosystem services : a transdisciplinary approach to sustainability in Barcelona

Unidad de excelencia María de Maeztu CEX2019-000940-MEcosystem services (ES) from urban green and blue infrastructure (GBI) provide cities and their citizens with benefits necessary to cope with present and future sustainability challenges. Long-term comprehensive urban greening strategies, policies, and plans are thus central to the development of sustainable, liveable, and resilient cities. However, urban greening strategies are increasingly tailored to provide short-term benefits, overlooking the dynamic character of cities, which face both changes in the capacity of GBI to provide benefits (e.g., in the face of climate change) as well dynamic needs and preferences for benefits over time as a result of changing demographic compositions. Starting with a literature review on GBI-relevant policies for the city of Barcelona, we: (1) investigated the presence of resilience thinking in the city's GBI-relevant policies through the application of the urban ecosystem services resilience assessment matrix; (2) investigated resilience thinking in the city's policies through the co-development of scenario narratives of possible futures and their implications for ES; and (3) applied the narratives through a participatory approach to enhance stakeholder thinking on adaptive policies based on possible shifts in ES provision and needs. Application of the matrix identified two main gaps to current GBI-relevant policies related to two main aspects of resilience: recognition and assessment of possible future disturbances and changes, and low understanding of social and structural diversity. Through the co-development of four future scenario narratives (aging and shrinking population, enhanced tourism, gender inequalities, and global warming), stakeholders identified the most susceptible ES in the city of Barcelona. Workshop participants indicated mental well-being, regulation of microclimate, social cohesion, air purification, physical recreation, runoff control, and soil permeability as ES with the widest capacity-demand mismatch. The results elicited discussion around GBI and ES resilience, addressing the need for intersectoral policy integration (including housing, education, and mobility) and for fostering a wider understanding of the role of institutions in providing for a resilient urban future. Through the use of scenario narratives, and highlighting the potential of co-creation, the proposed approach enhances critical thought around ES resilience among key players in the city. The study thereby supports the development of a comprehensive resilience strategy for Barcelona and indicates pathways for how other cities can change their current urban trajectory towards sustained ES flows

Based on nature, enabled by social-ecological-technological context : deriving benefit from urban green and blue infrastructure

Peer reviewe

Contribution of ecosystem services to air quality and climate change mitigation policies : the case of urban forests in Barcelona, Spain

Mounting research highlights the contribution of ecosystem services provided by urban forests to quality of life in cities, yet these services are rarely explicitly considered in environmental policy targets. We quantify regulating services provided by urban forests and evaluate their contribution to comply with policy targets of air quality and climate change mitigation in the municipality of Barcelona, Spain. We apply the i-Tree Eco model to quantify in biophysical and monetary terms the ecosystem services "air purification," "global climate regulation," and the ecosystem disservice "air pollution" associated with biogenic emissions. Our results show that the contribution of urban forests regulating services to abate pollution is substantial in absolute terms, yet modest when compared to overall city levels of air pollution and GHG emissions. We conclude that in order to be effective, green infrastructure-based efforts to offset urban pollution at the municipal level have to be coordinated with territorial policies at broader spatial scales

Tracing and building up environmental justice considerations in the urban ecosystem service literature : A systematic review

Unidad de excelencia María de Maeztu CEX2019-000940-MAltres ajuts: Acord transformatiu CRUE-CSICThe concept of ecosystem services (ES) has mainstreamed as an interdisciplinary framework in the urban sustainability and resilience agenda. While the uptake of ES in urban areas is deeply entangled with multiple values, trade-offs, institutions, management and planning approaches, there is still a lack of a comprehensive and systematic framework to address environmental justice (EJ) in urban ES assessments. This article presents a systematic literature review to examine what factors are critical for the effective inclusion of an EJ lens in urban ES appraisals. More specifically, we assessed how distributional, procedural and recognitional EJ dimensions have been addressed, and in relation to which types of urban ES. Our results reveal that EJ considerations are currently focused on the (un)equal distribution of ES and the associated green and blue infrastructure with regard to socioeconomic groups, with special attention to income and race/ethnicity as the main mechanisms of social stratification. There is also a predominant focus on regulating and cultural ES, analyzing their role on resilience and adaptive capacity on one hand, and recreational values, social cohesion and place-making on the other. In this review, we also evaluate the interconnected dimensions of justice and their constraints, and lay out pathways for new research into intersectional and restorative approaches to justice in ES assessments. Finally, we interrogate what the role of urban ES-based planning might be in making more inclusive and just cities and explore its implications for policy and practice

A take-home message from COVID-19 on urban air pollution reduction through mobility limitations and teleworking

Unidad de excelencia María de Maeztu CEX2019-000940-MThe rigorous traffic limitations during COVID-19 have forced many people to work from home, reaching an outstanding degree of teleworking and reduction in air pollution. This exceptional situation can be examined as a large-scale pilot test to determine the potential of improving urban air quality through teleworking. Based on observed traffic reductions during the COVID-19 lockdown in Barcelona, we formulate socio-occupational scenarios, with various configurations of teleworking, and simulate them using the chemistry transport model WRF-Chem with multi-layer urban scheme. By intensifying teleworking to 2, 3, and 4 days a week, averaged NO2 concentrations are reduced by 4% (−1.5 μg m−3), 8% (−3 μg m−3), and 10% (−6 μg m−3), respectively, while O3 increases moderately (up to 3 μg m−3). We propose that teleworking be prioritized and promoted as an effective contribution towards reduction of long-term urban air pollution and short-term pollution peaks