Research & reports

Jassen Callender · · Global

This essay frames city sustainability as a lifecycle question centered on end-states, arguing that water and soil are essential supports for urban farming — water comprising three interlinked cycles and soil representing a phase of nutrient cycling — and that lifecycle concerns intersect with cities' basic, "physiological" needs in Maslow's sense. It presents a conceptual discussion rather than original data, measurements, or a defined study population.

Melanie Jans-Singh, Rebecca Ward, Ruchi Choudhary · Journal of Building Performance Simulation · United Kingdom

A study addressing the lack of quantification of combined building-integrated greenhouse performance developed a building energy simulation (BES) of an archetype school building in EnergyPlus, co-simulated with a validated greenhouse energy simulator (GES), for school buildings in London, UK. Different greenhouse-building coupling configurations were evaluated via sensitivity analysis and a parametric study to estimate potential crop growth, heat recovery, and reduction in ventilation demand. A 250 m2 greenhouse on the top floor of the school could produce 6 t of lettuce with half the energy demand of an equivalent standalone greenhouse. Trade-offs among increased humidity, yields, and energy efficiency show that modeling is needed to ensure optimal designs.

Nora Gavare · Landscape architecture and art · Europe

In Sigulda, Latvia, the community garden "AUDZ," open to everyone, was created as a local, small-scale response to 21st-century problems including the depletion of natural resources, air pollution, rising industrial production, waste and an aging society. Designer Nora Gavare took part in an ERASMUS+ international training mobility visit on "Development of urban environment" in Hong Kong, where she gained insight into overpopulation, rapid urban growth at the expense of natural habitat, and rising food product demand. Photo mapping of Sigulda's public environment across different periods led to the conclusion that, given the town's rapidly growing population, fostering a sense of community and education processes is needed because opportunities for interaction among different social groups are lacking.

Aamir Mehmood Shah, Gengyuan Liu, Fanxin Meng, Qing Yang, Jingyan Xue, Stefano Dumontet, Renato Passaro, Marco Casazza · Energies · Global

This review article examines knowledge gaps regarding small-scale urban green-blue infrastructure (GBI) from the perspective of the food-energy-water (FEW) nexus, focusing on the literature on urban ecosystem services (positive effects) and dis-services (negative effects) associated with different GBI typologies. It found that GBI can contribute environmentally, socially, and economically to FEW security and urban sustainability, but that these positive effects must be weighed against ecosystem dis-service tradeoffs: urban food production is commonly connected with heavy water and energy consumption, particularly under dry climate conditions, and is sometimes linked to excessive use of manure, pesticides, or fertilizers that can pose risks to water quality and local insect survival, or to enhanced mosquito breeding from irrigation. The review also found that few nexus modeling techniques have been discussed in terms of their benefits, drawbacks, and applications.

Johan Colding, Stephan Barthel, Robert Ljung, Felix Eriksson, Stefan Sjöberg · Social Inclusion · Global

A conceptual paper drawing on the authors' prior research on urban commons to examine their role in climate-proofing activities. It distinguishes three types of environmentally oriented urban commons: "urban green commons" such as allotment and community gardens, which the authors say contribute to environmental learning that supports climate-change mitigation and adaptation; "coworking spaces," framed as reducing commuting and domestic transportation through a sharing economy; and "community climate commons," where local communities pool resources to create shared low-carbon assets. The paper closes by identifying determinants for scaling up such commons, without presenting original empirical data.

Pedada Sindhusha · Journal of Food & Nutritional Disorders · India

As India's urban population grows, demand for food and food expenditure are rising while farmland is being converted to residential, commercial or industrial use. The paper argues that rooftop vegetable farming is a feasible option to address these pressures and the contamination risks of chemical fertilizers and pesticides, by shortening food transport distances, raising food-production awareness, and supporting nutrition, health and economic status. It states that rooftop vegetable farming can supply quality, hygienic vegetables, lower household vegetable spending, improve air quality and absorb carbon, and reduce climate change effects. No data or survey results are presented.

Isaac Kwadwo Mpanga, Ursula K. Schuch, Jeff Schalau · Current Research in Environmental Sustainability · United States

A study in north-central Arizona, United States, investigated land use and farm practices among small-scale growers and their role in resilient, sustainable local food production. Amid rising pressure from population growth and extreme climate on agricultural land, Arizona's average farm size fell 57% while the number of farms rose 127% between 1997 and 2017, and family farms under 10 acres now make up 50% of the state's farmer population. The study found that 52% of the surveyed small farms were family operations, with regenerative and sustainable practices predominating — cover cropping (27%), compost use (26%), crop rotation (23%), animal or green manure (22%), no-till (21%), and reduced tillage (18%) — while conventional practices such as intensive tillage (5%) and synthetic fertilizers (13%) were less common. For pest, weed, and disease control, 95% of growers used biological, cultural, or mechanical methods versus 5% using conventional synthetic chemicals, and for irrigation, 78% used water-saving methods (drip, subsurface, sprinkler) while 11% used open flood irrigation.

· 農林水産省（2021年5月策定） · Japan

MAFF's 2021 strategy for a sustainable food system, setting 2050 KPIs including a 50% cut in chemical pesticide use (risk-weighted), a 30% cut in chemical fertiliser use, and expanding organic farming to one million hectares — 25% of Japan's cultivated land.

農林水産省 · 農林水産省（みどりの食料システム戦略本部） · Japan

The official portal for MAFF's 'Strategy for Sustainable Food Systems, MeaDRI' (Midori Strategy), decided May 12, 2021. It aims to reconcile productivity growth with sustainability in Japan's food and agriculture sector through innovation, targeting development of key technologies by 2040 and full social implementation by 2050. Interim 2030 KPI targets were decided June 21, 2022.

Global Methane Pledge · Global Methane Pledge / Climate and Clean Air Coalition (CCAC) · Global

Launched at COP26 in 2021 by the EU and the US, the Global Methane Pledge is a voluntary initiative to cut global methane emissions at least 30% below 2020 levels by 2030, with 159 participating countries plus the European Commission. Methane is described as responsible for 30% of total warming since the Industrial Revolution, and without action, emissions are projected to rise by up to 13% between 2020 and 2030.

Alicja Kolasa-Więcek, Dariusz Suszanowicz · Environmental Science and Pollution Research · Europe

This study conducted field tests on model roofs and GIS-based building potential analysis in two districts of Opole, Poland, proposing a methodology to forecast reduction in rainwater drainage load from green roof deployment. Rainfall up to 5 mm/day is completely retained by both intensive and extensive roofs, and about 44% of torrential rainfall is retained. The runoff reduction coefficient is 0.63 for extensive roofs and 0.74 for intensive roofs; installing green roofs on 25% of suitable buildings is estimated to reduce drainage load enough to prevent localized flooding.

WRI Ross Center Prize for Cities · WRI Ross Center Prize for Cities · Argentina

Rosario, Argentina launched an urban agriculture program in response to the 2001 economic crisis, evolving through a 2004 ordinance allowing temporary use of vacant land, two flood-mitigating 'Parques Huerta' opened in 2007-2008, and a 2011 ordinance designating 800 hectares of peri-urban land as a green belt. The program now covers 75 hectares of agroecological production plus the 800-hectare peri-urban belt, yields 2,500 tons of produce a year, involves more than 2,400 participating families, and has created 7 new permanent market spaces. Locally produced vegetables are estimated to cut associated greenhouse gas emissions by as much as 95%, and the project won the WRI Ross Center Prize for Cities 2020-2021 grand prize.

Beatriz Salazar · CEPES (Centro Peruano de Estudios Sociales) · Peru

A CEPES article describing biohuertos run by communal kitchens (ollas comunes) in metropolitan Lima, a practice underway for roughly a decade under the legal framework of Ordinance 1629 (enacted 2012). It cites implementation across 12 districts without giving specific garden or participant counts, and concludes that such urban agriculture initiatives should be incorporated into Local Climate Change Plans and funded under regulations for the country's food emergency law.

Giuseppe Pulighe, Flavio Lupia · Sustainability · Global

The COVID-19 pandemic highlighted the fragility of large cities to global risks and the importance of food availability. Border closures and movement restrictions increased food losses and export costs, particularly for perishable goods. This paper suggests fostering urban agriculture in developed countries with practices like vertical farming, hydroponics, and rooftop greenhouses to mitigate uncertainties from global systemic risks.

Muhammad Mumtaz Khan, Muhammad Tahir Akram, Rhonda Janke, Rashad Qadri, Abdullah M. Al‐Sadi, Aitazaz A. Farooque · Sustainability · Global

This study reviews contemporary urban horticulture, illustrating traditional and innovative developments, as a response to global concerns about food supply and environmental protection in urban settings, exacerbated by factors like population growth and the COVID-19 pandemic. It highlights how current urban cropping systems can be enhanced with modern techniques like vertical gardening and hydroponics. These methods are presented as eco-friendly, energy-saving, and capable of ensuring consistent fresh food supplies and more sustainable agriculture.

Nur Huzeima Mohd Hussain, Nur Hayati Hashim, Asmat Ismail · Malaysian Journal of Sustainable Environment · Global

This paper conceptually reviews the ideas, issues, and imperatives of implementing urban farming on rooftops, investigating an alternative for urban dwellers to achieve resilience. It uses comparative analysis of established texts and secondary data from cases in Singapore, Japan, USA, and Thailand. The study aims to localize the concept of rooftop urban farming and establish a conceptual discourse for its implementation in Malaysia.

Maha Deeb, Peter M. Groffman, Manuel Blouin, Sara Perl Egendorf, Alan Vergnes, Viacheslav Vasenev, Donna L. Cao, Daniel C. I. Walsh, Tatiana Morin, Geoffroy Séré · SOIL · Global

This review examines the use of Constructed Technosols (CTs), mixtures of organic and mineral waste, for green infrastructure (GI) in urban spaces. While CTs have high potential to provide multiple soil functions and contribute to urban greening, urban soils are often physically, chemically, or biologically unsuitable for GI features. The analysis suggests that the composition and structure of CTs should be adapted to available wastes and by-products, as well as future land use and environmental conditions, highlighting the need for careful design to overcome existing limitations.

Annemarie Tabea Rost, Victoria Liste, Corinna Seidel, Lea Matscheroth, Marco Otto, Fred Meier, Daniel Fenner · Atmosphere · Germany (Berlin)

This study measured nocturnal air temperatures in 13 allotment garden complexes (AGCs) during the summer of 2018 in Berlin, Germany, comparing them to measurements in densely built-up urban areas, two large inner-city parks, and rural areas. On average, the assessed AGCs were 2.7 K cooler at night than urban areas, and most investigated AGCs (11/13) showed a larger mean nocturnal air temperature difference than urban parks. The nocturnal air temperature difference decreased significantly as the floor space index around AGCs increased, and shape complexity showed a significant positive correlation, while AGC size and distance to the city center significantly decreased with increasing nocturnal air temperature difference.

Dan Wen, Ni‐Bin Chang, Martin P. Wanielista · Scientific Reports · Global

This study assessed the nutrient removal efficiencies of Iron Filings-based Green Environmental Media (IFGEM) for stormwater runoff, using an isotherm study, a column study of reaction kinetics, and microstructure examination. IFGEM, made from recycled materials like tire crumb and iron filings, demonstrated over 90% nitrate removal and 50-70% total phosphorus removal under most inlet conditions. The ammonia byproduct allows for potential reuse of spent IFGEM as soil amendments in urban farming applications.

Karto Wijaya, Asep Yudi Permana, Syarip Hidayat, Heru Wibowo · Jurnal Arsitektur ARCADE · Indonesia (Bandung)

Bojongsoang Village in Bandung Regency, Indonesia, faces a loss of green space due to urbanization, rendering productive land unproductive. This study aims to determine an Eco Village model in the Paralon village area, utilizing urban farming and eco-architecture concepts, to support the development of sustainable cities by optimizing available land and space, including vertical planes. The abstract does not present specific findings or results from the implementation of such a model.

Kareem Buyana, Shuaib Lwasa, Denis Tugume, Paul Isolo Mukwaya, Jacqueline Walubwa, Samuel Owuor, Peter Kasaija, Hakimu Sseviiri, Gloria Nsangi, Disan Byarugaba · Environmental Research Letters · Africa

This qualitative systematic review examined academic and policy evidence to identify emerging interventions for enhancing climate change resilience in African cities. At the neighborhood scale, resilience often stems from urban agriculture and forestry, alternative energy from wastes, and adjustments in irrigation schedules. At the city scale, planning targets buildings, mobility, and energy service delivery. The review found that evidence on comparisons across regions mainly covers East, West, and South African cities, with less on Northern and Central Africa, and primarily focuses on capital cities rather than secondary cities and towns.

Paule Olivia Akotto, Dorothée Boccanfuso, Marie-Ève Yergeau · Cahiers de recherche · Global

This exploratory review synthesizes 35 reports and articles published between 1980 and 2019 to assess the potential of urban and peri-urban agriculture (UPA) to build resilience against poverty, food insecurity, and environmental challenges in developing countries. The review found that UPA creates one job for every 50 to 100 individuals, but these jobs are generally seasonal, and market access remains a significant constraint for farmers.

Monika Egerer · · Global

This chapter discusses how climate-related factors and climate change may affect the biodiversity of plants and animals in urban agroecosystems, and the ecosystem functions and services they provide. It notes that little research in urban agroecology explicitly investigates the impacts of local weather patterns or regional climate cycles on biodiversity, ecosystem functions, or service delivery. The chapter aims to bridge agricultural and urban literature to enhance understanding of social-ecological processes in urban agroecosystems during the climate change era.

Mohammad Hasan Chowdhury, Md. Fahim Sharker Eashat, Chinmoy Sarkar, Nafisa Habib Purba, Mohammad Asadul Habib, Plabon Sarkar, Lincon Chandra Shill · International Multidisciplinary Research Journal · Bangladesh (Dhaka)

Rooftop gardening for vegetable production has gained momentum in Dhaka City, Bangladesh, offering alternative spaces for urban agriculture and contributing to agricultural sustainability. While rooftop agriculture can improve ecosystem services, biodiversity, and food security, its widespread implementation is currently limited by multiple challenges. Green roofs are considered a supplement to other urban food production sources, not a total solution for food security.

Cristiana Peano, Stefano Massaglia, Chiara Ghisalberti, Francesco Sottile · Sustainability · Africa

This work reports case studies from the Slow Food Association in Africa to demonstrate the importance of agroecological models in small-scale agricultural systems. It focuses on the development of school and community gardens in small urban areas across different African countries. These models are presented as a tool for integrating agricultural activities aimed at social resilience and the conservation of ecosystems, aligning with SDG #12 Responsible Production and Consumption.