Research & reports

최지원, 오충현 · 한국환경생태학회 학술발표논문집 · South Korea

A study of urban agriculture in Gangdong-gu, Seoul, South Korea, reviewing about ten years of activity from the district's 2010 enactment of Korea's first eco-friendly urban agriculture support ordinance through its 2019 comprehensive plan, assessed across economic, environmental-ecological and social dimensions using Lee Chang-woo's (2016) functional classification and a resident satisfaction survey, to derive directions for the next urban agriculture master plan. On the economic side, following the district's first urban garden plots opened in the Gangil-dong area in 2009, by January 2019 there were 39 sites totaling 145,806 square meters across 6,873 plots, and in 2018 the Gangdong Urban Agriculture Support Center ("Ssingssing Dream") recorded produce sales of 348,218,000 KRW and donated 3,204 kg of produce to low-income households. On the environmental side, urban beekeeping begun in 2013 had grown to roughly 40 hives by 2018, alongside 25,923 box gardens and 121 rooftop gardens (totaling 1,828 square meters) established by 2018; on the social side, rooftop gardens at eight welfare facilities hosted a total of 107 horticultural therapy sessions by 2018.

Julian Cribb · Cambridge University Press eBooks · Global

This concluding chapter lists the book's policy recommendations without presenting new data: build a global food system based on regenerative farming, aquaculture and urban food production; redesign cities to recycle nutrients and water into local, climate-proof food production under permaculture principles; reallocate 20% of world military spending to food-based conflict prevention; rewild half the planet under leadership of small farmers and indigenous peoples; introduce a "Year of Food" in every primary school; and put women in leadership across business, politics, government, religion and society.

Sejabaledi Agnes Rankoana · Journal of Water and Climate Change · South Africa

A study in the Sagole community of Limpopo Province, South Africa, assessed the use of geothermal hot spring water as an adaptation practice to improve subsistence crop production. Focus group discussions with 45 subsistence farmers who grow and maintain crops in a community garden irrigated by the hot spring found that farmers were aware rainfall in the Sagole community is becoming scarce, and that this rainfall scarcity is negatively impacting subsistence crop production, characterized by poor productivity. In response, farmers had developed their own irrigation system downstream of the geothermal hot spring, furrowing the water to the garden to irrigate vegetables and fruits year-round.

Alice A. Oluoko-Odingo · Journal of Climate Change and Sustainability · Sub-Saharan Africa

This paper examines gender mainstreaming in adaptation to weather and climate extremes, centered on peri-urban farming in Sub-Saharan Africa. Although women provide most agricultural labour, they remain poor and among the most vulnerable to weather and climate extremes because of inequalities in ownership of and decision-making over land, assets and cash; even in well-planned African cities, developmental and environmental challenges continue to perpetuate inequality, discrimination and underdevelopment, with low-income communities living in risky areas without access to key services and facing heightened vulnerability. Combining literature review with fieldwork in peri-urban Nairobi (Machakos and Kajiado Counties), Kenya, the paper discusses how gender mainstreaming in peri-urban farming could support Sustainable Development Goals 5 and 13, while noting the research gap on gender mainstreaming in peri-urban farming as itself a problem the field has yet to address.

Nazli Uludere Aragon, Michelle Stuhlmacher, Jordan P. Smith, Nicholas Clinton, Matei Georgescu · Environmental Research Letters · United States (Phoenix)

This city-scale study analyzed how urban agriculture (UA) could contribute to Phoenix's 2050 Sustainability Goals, eliminating food deserts, providing green open space, and reducing building energy use and CO2 emissions, for the fifth-largest US city by population. Examining three UA deployment surfaces (undeveloped vacant lots, flat rooftops, building facades), it found existing building stock provides 71% of available UA space in the study area; estimated total UA food supply is 183,000 tons per year, enough to provide local produce in all existing Phoenix food deserts and meet 90% of current annual fresh-produce consumption based on national per-capita patterns. UA would also add green open space, reducing by 60% the number of block groups underserved by public parks, and rooftop UA deployment could reduce building energy use and potentially displace more than 50,000 tons of CO2 per year.

Ioannis Manikas, George Malindretos, Konstadinos Abeliotis · Journal of International Food & Agribusiness Marketing · Global

An essay that states urban food production is exposed to high levels of urban-generated contaminants, and argues that urban floriculture - an intensive form of agriculture with income per unit area far higher than other agricultural branches - can offer a more sustainable and socially acceptable alternative to urban food production. It states floriculture may also reduce the carbon footprint of cut-flower transport and provide higher-quality seasonal product, and examines urban floriculture as an approach for mitigating the negative impacts of global floriculture supply chains.

Asnath Alberto Malekela · · Tanzania

In Dar es Salaam, Tanzania, a study of climate change impacts on urban and peri-urban agriculture (UPA) drew on secondary literature plus primary data from structured and in-depth interviews, observations, and focus group discussions with 201 UPA practitioners. 84% of respondents engaged in UPA for food and income, and UPA made a positive contribution to food security. However, UPA was found to be severely affected by climate change: effects included drying of crops (41%), crop pests and diseases (28%), decreased crop yields (13%), loss of soil fertility (8%), animal diseases (43%), drying of pasture lands (41%), and livestock deaths (16%). The study states plainly that urban and peri-urban agriculture in Dar es Salaam is severely affected by climate change, and recommends adopting farming systems such as vertical farming that use limited water resources.

Michael Martin, Elvira Molin · Sustainability · Sweden

This study assessed the environmental impacts of urban vertical hydroponic farming through a life-cycle perspective, applied to a case-study vertical hydroponic farm in Stockholm, Sweden, comparing current performance with potential improvement scenarios. Results showed that growing medium, pots, electricity demand, and transportation of raw materials and product deliveries were the important contributors to environmental impact in this system. Replacing plastic pots with paper pots was found capable of producing large reductions in GHG emissions, acidification impacts, and abiotic resource depletion, and replacing conventional gardening soil with coir as the growing medium also led to large impact reductions. However, the study states that further reducing the system's impacts will require more resource-efficient steps specifically to address impacts from electricity demand, an issue not resolved by the pot and growing-medium substitutions, and identifies potential for more symbiotic exchanges using urban wastes and by-products.

Beatrice Atieno Otieno, Davis Bwire Namiripo · Australian Herbal Insight · Global

Urban gardening, an ancient practice, is described as having gained renewed significance amid rapid urbanization and associated challenges including environmental degradation and declining mental health. This study explored the multifaceted role of urban gardening in environmental, social, and health dimensions of sustainable urban development across five cities: New York, Berlin, Mumbai, São Paulo, and Nairobi. It combined structured surveys of 300 participants (covering air quality, access to fresh food, social interactions, and mental health), semi-structured interviews with 30 stakeholders including city planners and community garden managers, field observations of gardens' ecological and physical characteristics, and a review of secondary data. Results showed 67% of respondents reported improved mental health, with São Paulo and New York showing the most positive outcomes. Urban gardening contributed to reducing the urban heat island effect, with temperature reductions of up to 4°C, enhanced biodiversity by hosting various plant species that created habitats for pollinators, and served as social hubs fostering community engagement and inclusivity; 60% of respondents in São Paulo reported improved access to fresh food. The study concludes that urban gardening significantly enhances environmental sustainability, social cohesion, and mental health, particularly in marginalized communities, but states that challenges such as land access and insufficient policy support hinder its potential.

Magdalena Grochulska-Salak · Practice, progress, and proficiency in sustainability · Global

This book chapter, a conceptual rather than empirical piece, defines urban farming as building development for producing plants to meet local community needs and discusses shaping urban farms to preserve the environmental balance of urban spaces alongside the coexistence of architecture and greenery. It argues that technologies such as hydroponic and aeroponic production integrated into buildings can complement a city's functional and spatial structure in connection with public spaces and green systems, positioning the urban farm as an element of sustainable urban development.

Ana Nadal, Daniel Rodríguez-Cadena, Oriol Pons, Eva Cuerva, Alejandro Josa, Joan Rieradevall · Urban forestry & urban greening · Global

This study assessed the feasibility of implementing rooftop greenhouses (RTGs) in the social housing neighborhood "La Comuna Santa Clara de San Millán" in Quito, Ecuador. Standard assessment methods were adapted for a social neighborhood in three steps: characterization based on criteria, determination of available roof surface, and estimation of production, self-sufficiency, and self-supply. The results showed that 33.2% (7.70 ha) of the neighborhood's rooftops had short-term feasibility for installing rooftop greenhouses, with the potential to produce 1,579,140 kg of tomatoes and 56,720 kg of lettuce per year.

Sofie Bates · Eos · Global

This short item reports that placing plants near building air vents may help them grow better by drawing on carbon dioxide exhaled by people indoors, while also reducing the carbon emissions released to the outside air. No experimental method or data are given.

Irene J. Klaver, J. Aaron Frith · · Global

This chapter considers cities as agents of change by examining the socio-cultural-political implications of transitioning urban hydrological infrastructure from "gray" to "green." It argues that traditional gray infrastructure -- especially impermeable surfaces -- is costly, inefficient, and damaging to ecosystem processes, while green infrastructure -- hybrid planned spaces such as parks, wetlands, non-concrete detention ponds, and rooftop gardens -- creates permeable surfaces that allow water infiltration and other natural processes. Using a case study of detention pond SCS16 in Denton, Texas, the chapter suggests that making urban water infrastructure visible can renew community connections with water and allow urban dwellers to experience water as more than a mere utility.

Florian C. Guenther · Current Urban Studies · Global

Anticipating that 68% of the world's population will live in cities by 2050, this discussion paper argues for integrating agriculture into urban planning through ecological agricultural practices. It contends that ecological practices such as Conservation Agriculture improve soil health and crop yield, making them key to producing vegetables and fruit for urban demand while reducing transport emissions, and that extending green space through ecologically cultivated land can reduce the urban heat island effect, store more carbon in healthy soils, and improve water run-off to reduce flood risk; the paper presents no empirical data.

Jennifer M. Kreslake · Health Equity · United States

An online survey of 605 residents in California (Los Angeles/Orange), Florida (Miami-Dade/Broward), and Arizona (Maricopa) counties, conducted in July 2018, used multivariable ordered logistic regression to test whether perceived importance of local climate change adaptation and mitigation measures differed by social and medical factors, controlling for age, political party, and county. Lower income was associated with higher perceived importance of improved emergency alerts, government-subsidized air conditioners and energy-efficient appliances, strengthening buildings against extreme weather, greenhouse gas regulation, "cooling" urban planning technologies, and expanding community gardens and local agriculture. Black respondents rated evacuation services for those with financial barriers, subsidized appliance costs, and government communication about climate impacts as significantly more important than non-Black, non-Hispanic respondents, while Hispanic respondents rated several measures, including improved emergency alerts, as significantly more important than non-Hispanic respondents.

Donald Gray, Laura Colucci‐Gray, R.A. Donald, Aristea Kyriacou, Daniel Wodah · Scottish Educational Review · United Kingdom

A study of a school garden project in three regeneration areas of a Scottish city, run in partnership among a teacher education institution, an NGO, a city council planning and infrastructure department, and three primary schools, used a semi-ethnographic approach to collect observation data, visual data, and teacher and pupil interviews. Analyzed through a socio-material lens, the findings articulate significant changes in the discourses and practices of learning associated with school gardening: beyond delivering curricular outcomes or practical skills, tending the gardens and growing food contributed to a learning aesthetics that foregrounds the centrality of the body in learning, acknowledges the living state of materials, and positions children's actions as ways of being and becoming in the world.

Intergovernmental Panel on Climate Change (IPCC) · IPCC National Greenhouse Gas Inventories Programme (IGES) · Global

This IPCC guideline chapter sets out the First Order Decay (FOD) methodology for estimating methane emissions from solid waste disposal sites. The default fraction of degradable organic carbon that decomposes (DOCf) is 0.5 for bulk waste and 0.7 for food waste. For high-moisture, rapidly degradable waste such as food waste, k=0.2 (half-life of about 3 years) is indicated, versus k=0.02 (half-life of about 35 years) for dry, slowly degradable waste.

Vergara, S.E., Silver, W.L. · Environmental Research Letters · United States

A study measuring greenhouse gas emission patterns and emission factors from windrow composting of organic waste. The methane emission factor was 1.7 ± 0.32 g CH4/kg wet feedstock, CO2 was 19 ± 3.7 g CO2/kg, and nitrous oxide was below instrument detection limits. Life-cycle emissions, accounting for avoided emissions and carbon sequestration, were negative at −690 g CO2-e/kg, indicating a net mitigation benefit.

Duren, R.M., et al. · Nature · United States

Using an airborne imaging spectrometer to survey more than 272,000 infrastructure elements, this study measured methane point-source emissions across California. Net methane point-source emissions were estimated at 0.618 teragrams per year (95% CI 0.523-0.725), equivalent to 34-46% of the state's total methane inventory. Ten percent of point sources contributed roughly 60% of point-source emissions, with landfills accounting for 41% of point-source emissions, dairies 26%, and oil and gas 26%.

NYC Department of Buildings · NYC Department of Buildings · United States

Per an NYC Department of Buildings service notice, beginning November 15, 2019, new buildings and buildings undergoing a complete roof deck or assembly replacement must provide a sustainable roofing zone covering 100% of the roof. That zone must include a solar photovoltaic system generating at least 4kW, a green roof system, or a combination of both.

Martina Artmann, Katharina Sartison · Sustainability · Global

A systemic literature review of 166 academic articles focusing on the Global North examined urban and peri-urban agriculture (UPA) as a nature-based solution. The review found that UPA contributes to ten key societal challenges of urbanization, including climate change, food security, and public health, by providing social, economic, and environmental co-benefits. The study developed an integrative assessment framework for evaluating UPA implementation and impact efficiency, which should be tested using edible cities as an example.

S. Alan Walters, Karen Stoelzle Midden · Agriculture · Global

Vegetable production on green roofs faces multiple challenges, resulting in minimal current activity despite its potential for urban agricultural sustainability. While intensive green roof systems are considered suitable for vegetable production, extensive systems with shallow-rooted crops like lettuce, kale, and radish show the greatest potential for sustained productivity due to building weight restrictions. Deeper-root crops like tomatoes require constant monitoring of fertility and moisture. Green roofs are not presented as a total solution for urban food provision.

Nicholas Clinton, Michelle Stuhlmacher, Albie Miles, Nazli Uludere Aragon, Melissa Wagner, Matei Georgescu, Chris Herwig, Peng Gong · Earth s Future · Global

This study developed a quantitative framework to assess global aggregate ecosystem services from urban agriculture (UA) using global datasets in Google Earth Engine. Existing urban vegetation provides an estimated $33 billion annually in ecosystem services. An intensive UA adoption scenario projects potential annual food production of 100–180 million tonnes, energy savings of 14–15 billion kilowatt hours, nitrogen sequestration of 100,000–170,000 tonnes, and avoided storm water runoff of 45–57 billion cubic meters. Under this intensive scenario, the value of ecosystem services could reach $80–160 billion annually, with significant country-to-country variability.

Τhomas Panagopoulos, Ilze Jankovska, Maria Boștenaru Dan · DOAJ (DOAJ: Directory of Open Access Journals) · Global

This article examines the role of urban agriculture as green infrastructure in city resilience, noting its ecological, cultural, social, and socio-economic value. It highlights that municipal intervention is crucial for urban agriculture, providing communal infrastructure and defining rules. The article concludes that urban agriculture, supported by municipal intervention, is instrumental for city resilience by serving as a vital source of food and occupation during crises and aiding adaptation to climate change.

Rachel Carey, Sarah James · · Australia (Sydney, Melbourne)

This chapter examines peri-urban agriculture in Australia, focusing on case studies in Sydney and Melbourne. It explores the pressures on peri-urban fringes, noting that while food needs are increasing due to population growth, the capacity of these areas to meet them is decreasing due to urban sprawl. The research highlights policy and planning options to protect these regions, emphasizing their potential contribution to urban sustainability and resilience amidst climate change and water scarcity.