Research & reports

Alex Opoku, Anna Duff, Moohammed Wasim Yahia, Samuel Ekung · Geography and sustainability · United Kingdom

This study investigated the use of green urban spaces for food self-sufficiency in the UK, examining how sustainable urban farms could reduce imported produce consumption and contribute to SDGs. A mixed-method approach included a survey of 115 respondents and interviews with 12 stakeholders from four urban farming groups. Findings showed a strong correlation between stakeholders' concerns about food origin/carbon footprint and imported produce, suggesting urban farms could play a vital role in food security and SDG realization.

Silvio Caputo, Victoria Schoen, Chris Blythe · Land · United Kingdom (London)

Data was collected from seven community gardens and one community farm in London, UK, during the 2019 and 2020 growing seasons using a citizen science approach, investigating crop yield, resource inputs, and social benefits. Results showed very mixed levels of crop and social productivity depending on organizational structure and agenda, with no clear pattern emerging. This study suggests that citywide productivity evaluations based on small data samples may not be reliable.

Carme Estruch, Sauveur Belviso, Alba Badía, Verònica Vidal, Roger Curcoll, Mireia Udina, Claudia Grossi, Josep-Antón Morguí, Ricard Segura, Sergi Ventura, Yolanda Solá, Gara Villalba · Journal of Geophysical Research Atmospheres · Spain (Barcelona)

This study measured the spatial distribution and variability of carbonyl sulfide (OCS) in four urban land uses in the Metropolitan Area of Barcelona, Spain, during May and October 2020. Urban values ranged from neutral to above background, suggesting anthropogenic and marine emissions, while agricultural areas showed OCS uptake during land breezes in May. Urban forests also showed significant OCS uptake, but marine and anthropogenic emissions from the port strongly impacted the spatial-temporal distribution of OCS, complicating the determination of the urban biosphere signal.

Susana Toboso‐Chavero, Antonio Luis Montealegre Gracia, Sergio García-Pérez, Jorge Sierra-Pérez, Joan Muñoz‐Liesa, Xavier Gabarrell, Gara Villalba, Cristina Madrid‐López · Sustainable Cities and Society · Spain (Cerdanyola)

This study investigated the supply potential and impacts of four roof mosaic scenarios for local food, energy, and water production systems on urban rooftops in Cerdanyola, a 58,000-inhabitant town in the Barcelona metropolitan area. Using spatial analysis, metabolism analysis, and impact assessments, the study found an average rooftop/household potential of 31 m2, with single-family housing showing the highest potential for electricity (51%) and water (14%) self-sufficiency. Housing estates achieved the highest vegetable self-sufficiency (32%), while rooftop farming systems showed the best performance for housing estates and originary fabrics in terms of overall impacts.

Runrid Fox-Kämper, Caitlin K. Kirby, Kathrin Specht, Nevin Cohen, Rositsa T. Ilieva, Silvio Caputo, Victoria Schoen, Jason K. Hawes, Lidia Poniży, Béatrice Bechet · Landscape and Urban Planning · Europe; United States

The relationship between urban agriculture (UA) and food-energy-water (FEW) nexus policies was analyzed using policy data from five case study cities in Europe and the U.S. (Dortmund, Gorzów Wielkopolski, London, Nantes, and New York City). An analysis of 78 policy documents and a Q-sort ranking by UA policy experts showed that the number, type, and degree of support for nexus policies varied among cities, and few policies (19) incorporated all elements of the nexus. Regulations were considered more effective at ensuring resource-efficient UA than incentives or awareness-raising policies.

Lisa Mølgaard Hald, Luke John Schafer · Agrosystems Geosciences & Environment · United Kingdom (Dartington)

This study examined soil organic carbon (SOC) in a food forest, redwood forest, pasture, and agricultural field in Dartington, UK, at 0-20 cm and 20-40 cm depths. Similar total SOC was found across all four systems. However, food forest soil showed similar long-term carbon storage to redwood forest, while pasture and agricultural fields stored less.

David Adams, Peter J. Larkham, Michael Hardman · Land · United Kingdom

This paper explores how porous boundary treatments and plot layouts can encourage ecological exchanges in new urban and peri-urban developments, focusing on a large-scale residential development in the English midlands. It outlines the socio-economic, cultural, and ecological significance of embedding diverse hedgerow designs into early planning, revealing a need to move beyond current models. The study suggests these designs could encourage sustainable land use and scalable urban agricultural systems.

Alessandra Como, Albina Cuomo, Luisa Smeragliuolo Perrotta · Sustainability · Italy (Pozzuoli)

In Pozzuoli, Southern Italy, multidisciplinary research addressed sustainability in urban agricultural landscape design. The study presented an integrated solution combining architecture and hydro-geomorphology for water management, accessibility, and use of urban agricultural landscapes. A prototype water and landscape infrastructure was developed, integrating a subsurface water system, cycle–pedestrian paths, and small-scale architecture around water tanks. This integrated system contributes to implementing green transition within cities.

Angelina Sanderson Bellamy, Ella Furness, Susanna Mills, Adrian K. Clear, Samantha Mitchell Finnigan, Elliot Meador, Alice E. Milne, Ryan T. Sharp · Frontiers in Sustainable Food Systems · United Kingdom

This study analyzed interview data and food diaries from Community Supported Agriculture (CSA) members and the wider UK population, using the 2019 EAT Lancet Commission dietary guidelines. It found that CSA members consumed diets closer to the EAT Lancet recommendations than controls, with significant differences in daily intakes of meat, dairy, vegetables, legumes, and sugar. CSA members' diets emitted on average 28% less CO2 compared to controls.

Claudia Pasquero, Marco Poletto · · Europe

This article introduces the Urban Algae Canopy, an innovative architectural system that redefines farming and horticulture within urbanism. It proposes agriculture as a tool for reprogramming Milan's public realm and challenges the separation between urban and rural conditions. The Urban Algae Folly aims to integrate technical and scientific research with societal needs through architectural design.

Evinç Doğan, Federico Cuomo, Luca Battisti · Sustainability · Italy (Turin)

This paper explored strategies for reviving urban greening in post-industrial landscapes through nature-based solutions (NbS), using the case of Turin's old FIAT premises in the Mirafiori Sud area. Data were collected through public literature review, interviews, and focus groups with policymakers, volunteers, and inhabitants. Qualitative thematic analysis showed that Mirafiori Sud became a co-creation hub for sustainable solutions, regenerative art in shared spaces was crucial for community engagement, and urban agriculture support could improve alternative food networks.

Mahir Yazar, Ece Baykal Fide, İrem Daloğlu Çetinkaya · Journal of Environmental Policy & Planning · Turkey

A 2023 study of climate policies in nine cities in Turkey examined how vulnerable groups and individuals are identified and how land-use policy is developed to address the identified vulnerabilities and climate justice concerns, using policy content analysis and expert interviews. The analysis found critical relationships between identified vulnerable groups, responsive land-use policy and climate justice. While social-aid municipalism-related vulnerabilities dominated districts' climate policies, nature-based solutions (NBS) — especially green infrastructure and urban agriculture — emerged as the dominant climate adaptation approach. However, the way urban vulnerabilities are prioritized in the climate and sustainability plans places less emphasis on intersectionality and infrastructure-related vulnerabilities, and tokenism of justice occurs in the policy documents: the plans do not incorporate vulnerable communities into land-use planning. The study concludes that the complexity of responsive land-use policy requires greater awareness of how to practically support vulnerable communities.

Julio César García-Colin, Carlos Díaz-Delgado, Humberto Salinas-Tapia, Carlos Roberto Fonseca, María Vicenta Esteller Alberich, Khalidou M. Bâ, Daury García-Pulido · Water · Spain

Using lysimeter data from a golf course in Spain, researchers designed and validated a sustainable urban agriculture drainage system with water reuse (SUADS-WR) based on a daily water balance, estimating reference evapotranspiration via the Penman-Monteith or Hargreaves-Samani methods. Compared with experimental data, estimated irrigation depths were lower than the water actually supplied, and estimated percolation matched measured field drainage. Implementing SUADS-WR allowed harvested water to cover more than 38% of the crop's annual water demand.

Miguel Borja Bernabé-Crespo, Jorge Olcina Cantos, Antonio Oliva Cañizares · Water · Spain

This paper proposes the concept of a "wastewater use basin" as a smaller-scale working unit than a traditional river basin, aimed at better managing sewerage-network water and urban stormwater in semi-arid and arid regions where water scarcity drives competition among urban, agricultural, industrial, and tourism demands. It is a geographically-focused proposal for integrated management of wastewater and stormwater that ultimately reaches a treatment plant for treatment and reuse. The study area is the southeastern Iberian Peninsula, Spain — the Campo de Cartagena–Mar Menor district (Murcia) and the Vega Baja district (Alicante). Analysis of recent torrential rainfall episodes in the Segura river basin found a clear tendency for these episodes to occur in coastal and pre-coastal areas, meaning the water does not reach the headwaters where the reservoirs are located. Based on the capacity of existing and planned environmental tanks, the study estimates that four cubic hectometers of additional water could be incorporated into the hydrological planning of the Segura basin. It concludes that rainwater collection adds a supplementary water volume that complements resources from treatment plants, serves as an adaptation measure to climatic extremes such as droughts and floods and to climate change, and supports circular management of water resources.

Angelica Mendoza Beltrán, Kelzy Jepsen, Martí Rufí-Salís, Sergi Ventura, Cristina Madrid‐López, Gara Villalba · The Science of The Total Environment · Spain (Barcelona)

This study mapped N2O emissions from peri-urban agriculture in the Metropolitan Area of Barcelona (AMB), Spain. Researchers spatially distributed factors like crop type, fertilizer use, and irrigation, creating N2O emission maps using crop-specific and Tier 1 IPCC emission factors (EFs). The study found that Tier 1 IPCC EFs estimated 15% more emissions (7718 kg N2O-N year−1) than crop-specific EFs (6533 kg N2O-N year−1) for the entire AMB, indicating higher emissions for rainfed crops with Tier 1 EFs and for irrigated horticultural crops with crop-specific EFs. The mapping helps evaluate spatial variability of key factors but carries uncertainties due to downscaling regional data.

Wim van Dijk, J.E. Jansma, J. Broeze, J.J.R. Groot · · Netherlands (Amsterdam)

This chapter focuses on regional resourcefulness for food systems, arguing that urban areas are vital for closing nutrient loops to prevent resource depletion. Two case studies in the Metropolitan Region of Amsterdam (MRA) discuss phosphorus (P) flows, exploring the potential of a circular food system in Almere and quantifying actual P-flows across the MRA. The chapter concludes that a circular City Region Food System is technically feasible but requires a fundamental shift in the organization of food and waste systems.

Elizabeth Regier, Walter McDonald · Journal of Sustainable Water in the Built Environment · United States (Milwaukee)

This study monitored two bioswales treating runoff from an urban farm in Milwaukee, WI, United States, to assess their hydrologic and water quality performance. The bioswales effectively reduced runoff volume, peak flows, total phosphorus, and high concentrations of total suspended solids (TSS >25 mg/L), achieving a median 98% load reduction across all pollutants. However, they showed mixed results in reducing total nitrogen concentrations and TSS at low influent concentrations (≤25 mg/L).

Elena Brunori, Alessandra Bernardini, Federico Valerio Moresi, Fabio Attorre, Rita Biasi · Plants · Italy (Rome)

A preliminary assessment of the adaptability of 15 Italian native and non-native Vitis vinifera L. cultivars to urban environmental stressors was conducted at the Botanical Garden of Rome during the 2021 growing season. Researchers evaluated leaf chlorophyll content, stomatal conductance, chlorophyll fluorescence, and spectral signatures. Native cultivars showed medium-high leaf chlorophyll content (>350 mol m−2), good photosynthetic efficiency (QY > 0.75), and optimal stomatal behavior under drought stress (200 > gs > 50 mmol H2O m−2 s−1), indicating site-specific resistance and resilience to urban conditions.

Angelica Mendoza Beltrán, Roc Padró, María José La Rota-Aguilera, Joan Marull, Matthew J. Eckelman, Jacob Cirera, Annalisa Giocoli, Gara Villalba · The Science of The Total Environment · Spain (Barcelona)

This study implemented an attributional, regionalized, cradle-to-gate life cycle assessment (LCA) to assess 14 environmental impacts of peri-urban agriculture (peri-UA) in the Metropolitan Area of Barcelona (AMB). It found that vegetables and greenhouses, the prevalent peri-UA land uses, had the largest assessed impacts among all peri-UA land uses. European NPK mineral fertilizer production to cover nitrogen demand for these crops drives all impacts. For fruit crops, on-site nitrogen emissions drive marine eutrophication impacts, and for irrigated herbaceous crops, phosphate runoff drives freshwater eutrophication impacts.

M.C.G. Haitsma Mulier, F.H.M. Van de Ven, Paul Kirshen · Energy Nexus · Netherlands (Amsterdam), United States (Boston)

This study quantified the Water Energy Nutrient Food (WENF) nexus for three urban farms: a greenhouse in Amsterdam, and a community farm and a container farm in East-Boston. It investigated the water, energy, and nutrient demands of these farms and the availability of resources in urban waters. The study found that the water and nutrient demands (nitrogen and phosphorus) of all three farms could be met by local urban water resources, but energy availability depended on the type of agriculture.

Antonia Lippert, Karina Pallagst, Patricia Hammer · Ra Ximhai · Germany (Dessau)

This bachelor thesis examines the revitalization of urban brownfields in shrinking cities, using the "Urban Farm Dessau" project as an example. It defines brownfields, revitalization, and urban farming, and details the GIAGEM project which develops alternative solutions for brownfield revitalization meeting bio-economic requirements. The "Urban Farm Dessau" project in Dessau-Roßlau is analyzed through a preliminary study and evaluated using a criteria grid, forming the basis for recommendations on its transferability to other cities.

Julia Wójcik-Madej, Barbara Sowińska-Świerkosz · Sustainability · Poland (Lublin)

A case study in Lublin city, Poland, applied objective criteria referring to seven societal challenges to 24 types of pre-existing interventions. All analyzed interventions met at least two challenges, with protecting wetlands, public parks, and allotment gardens showing the greatest challenge-orientation potential, while nesting boxes for bats and insect hotels showed the lowest. Interventions responded most to human health, climate change, and ecosystem degradation, and least to food security and socioeconomic development. The study concluded that the scale of intervention type is too general for challenge-orientation assessment.

Maicol Negrello, Daniele Roccaro, Kevin Santus, Isabella Spagnolo · DOAJ (DOAJ: Directory of Open Access Journals) · Europe

This paper examines urban agriculture's role in enhancing the resilience of European urban areas against climate change. Through a historical overview and analysis of contemporary case studies, it provides design tools for interventions at urban and architectural scales. The essay presents a replicable morpho-typological approach for designers and policy-makers to increase urban resilience.

Davide Marino, Giampiero Mazzocchi, Davide Pellegrino, Veridiana Barucci · Land · Italy

This study investigated the role of Ecosystem Services (ES) assessment within a "place-based policy-mix model" for urban planning, testing and integrating three ES assessment methodologies: mapping and assessment, expert-based evaluation, and social perception. Results indicate that mapping assessment assigns higher values to regulating ecosystem services, expert-based evaluation assigns slightly lower values to regulating ecosystem services, and social perception highlights the importance of cultural ES but tends to underestimate other ecosystem functions. These methodologies lead to sectoral, non-dialoguing policies based on partial and non-integrated information.

Petr Klusáček, Stanislav Martinát, Klára Charvátová, Josef Navrátil · Land · Europe

This study investigated the drivers of de-agrarianization in post-socialist cities, using Brno, Czech Republic, as a case study through qualitative interviews. It found procedural issues in preserving architectural heritage during the redevelopment of a former Cistercian monastery site, often resulting in only fragments being preserved. The research also demonstrated a decline in the use of urban agricultural properties, which are rapidly transformed into new urban environments under intense urbanization pressures.