Research & reports

Adili Y. Zella · African Journal of Social Issues · Tanzania

This study analyzed land use and land cover (LULC) changes in Kinondoni District, Dar es Salaam, Tanzania, between 1993 and 2023 using multi-temporal Landsat satellite imagery. The analysis revealed that built-up areas expanded by 1,433%, from 124.20 ha in 1993 to 1,905.14 ha in 2023. Concurrently, cultivated land decreased by 96.6%, from 172.90 ha to 5.88 ha, representing a loss of 167.02 ha. The near-complete elimination of cultivated land in Kinondoni District indicates a critical threat to local food production capacity and urban food security.

Katie J. Field, Yolima Carrillo, Stuart A. Campbell, Jurriaan Ton, Adam Frew · Plants People Planet · Global

This special issue presents an innovative framework for sustainable land use, leveraging synergies between plants, soils, and societies to address global environmental crises and food insecurity. It notes that human activities, including land clearing for agriculture, rapid urban sprawl, and heavy use of chemical inputs, have pushed biogeochemical cycles of carbon, nitrogen, and phosphorus beyond their safe operating limits. The collection of papers collectively emphasizes the need for a fundamental shift in managing plant, soil, microbes, and human systems as interdependent components.

Olivier Parfait Bissemb, Rosette Christelle Ndjib, Patrice Brice Mvogo Ottou, Jacques Bruno Ngotta Biyon, Zenabou Ndiang, Georges Maxime Lamy Lamy, Eric Ngansop Tchatchouang, Ivant Stevy Nganmo, Jean Lagarde Betti, Richard Jules Priso · Journal of Environmental Protection · Cameroon (Douala)

This study assessed floristic diversity and agricultural practices around five stormwater drains in Douala, Cameroon, identifying 67 species from 24 families. Floristic diversity, measured by the Shannon-Weaver index (H'= 0.99) and low evenness (E = 0.23), indicated an unbalanced plant community dominated by a few cultivated and ruderal species. The analysis also revealed significant homogenization between drains, suggesting common agricultural practices and environmental pressures in these polluted environments.

Margarethe Karpe, Jeremías Lachman, Lili Wang, L.F.M. Marcelis, E. Heuvelink · Sustainable Production and Consumption · Global

A Delphi survey with 108 experts explored urban agriculture's potential contributions to Sustainable Development Goals (SDGs) under a scenario of 30% urban food self-sufficiency. Experts identified SDG 7.2 (renewable energies) as a key challenge due to high energy use, and agreed that none of the evaluated SDG targets for urban agriculture will be met by 2030. They also noted a lack of regulations and public policies for innovative agricultural systems.

· The MIT Press eBooks · Global

This book examines community farms in Latin America, Australia, and China, highlighting tensions between local identities and global transformation. It finds that while industrial expansion in export agribusiness generates macroeconomic benefits, it incurs micro-level costs such as the replacement of peri-urban farms by plantations, loss of biodiversity, and groundwater contamination from pesticides and fertilizers. The study suggests that food system intermediaries are crucial in connecting rural migrants with urban farms and resources.

Sumit Vij, Vishal Narain · Wiley Interdisciplinary Reviews Water · Global

This review addresses a knowledge gap on how peri-urban residents in Asia and Africa adapt to the impacts of urbanization and climate change on water security. As rural-urban boundaries rapidly blur in the global South, peri-urban spaces are characterized by weakening access to water resources, depleting common property institutions and poor civic engagement, and the review presents the persistent marginalization of peri-urban residents from a water security perspective, while also showing that they do develop adaptation measures. Existing literature is found to focus primarily on (1) increased vulnerability of peri-urban agriculture and allied sectors, (2) barriers and enablers to water-security-related adaptation planning, and (3) justice in peri-urban areas, and the review calls for further study of emerging cooperation and collective action that could reduce conflicts between peri-urban and urban inhabitants and improve water security.

Madison Powers · · Global

This chapter surveys the food-security implications of agricultural land use, unsustainable features of widespread food production practices, and the debate over agricultural intensification versus extensification, then examines land use's consequences beyond the land itself for groundwater, surface water, oceans, ambient air quality, and planetary systems. It explains the causes of forest destruction and fragmentation driven by the global expansion of land used for "high-risk commodities," the linkage between deforestation and declining terrestrial biodiversity, and the global market dynamics driving both crises. It assesses socioeconomic and ecological shortcomings in some proposed nature-based solutions, showing that they perpetuate an unsustainable business-as-usual approach, and summarizes how these land-use issues are conceptualized as human-rights concerns and translated into policy proposals.

Ayşegül YARIŞ, Emel Karakaya Ayalp · Zenodo (CERN European Organization for Nuclear Research) · Global

The current agri-food system is undergoing an unsustainable transition, with Urban Food Planning emerging as a holistic approach for sustainable transition. This paper explains and translates the "City-Region Food System (CRFS) Toolkit," developed in partnership with FAO, RUAF, and participating cities. It examines the toolkit's roadmap and approach for building more sustainable and resilient urban food systems through two case studies in West Africa. The research concluded that the CRFS Toolkit defines limited tools for building sustainable urban food systems and excludes the relationship with spatial disciplines.

Ionat; id_orcid 0000-0001-9080-2282 Zurr, Oron; id_orcid 0000-0002-2893-5364 Catts · UWA Profiles and Research Repository (University of Western Australia) · Australia

The "Sunlight, Soil & Shit (De)Cycle" project, presented by SymbioticA in February 2022, is a performative experiment exploring agricultural technology (AgTech) and its aim to remove natural elements like sunlight, soil, and organic waste from food production. This project considers whether the precursor to sustainable food systems will be the creation of a metabolic rift, where the means of production grow ever distant from nature. It highlights a critical environmental tradeoff by questioning the separation of humans from nature in technological farming.

Thulani Dube, Saziso Sibanda, Phibion Chiwara · Cogent Social Sciences · Zimbabwe (Bulawayo)

This study investigated farmers' perceived effects of climate change on peri-urban agriculture in Bulawayo, Zimbabwe, and their adaptation methods. Using a sample of thirty peri-urban plots, findings revealed that farmers perceived significant climatic changes negatively impacting their farming activities, including reduced precipitation, increased atmospheric temperature, and diminishing borehole yields. Adaptation methods included repeated planting, watering plants at night, renting animal space in other farms with more water sources, and purchasing supplementary feed for livestock.

Salvatore Engel‐Di Mauro, George M. Martin · · Global

This chapter examines urban cultivation across diverse global contexts, finding that global South cities often experience declining food production due to displacement by financiers and landowners. It notes that urban cultivation is frequently associated with unacknowledged pollution problems, and its overall ecological impacts are not necessarily positive. Furthermore, urban food production, with the exception of Cuba, does little to reduce social inequality and can sometimes exacerbate it.

Carolina Baldini, Mariana Edith Marasas, Andrea Alejandra Drozd · Journal of Environmental Planning and Management · Colombia

A land-cover change study (Journal of Environmental Planning and Management, 2021) applied a supervised classification of Landsat satellite imagery from 1986, 1996, 2005, and 2015 to Argentina's largest peri-urban horticultural region in South America. Between 1986 and 2015, open-field horticulture extent decreased by 51.47%, while greenhouse area increased by 2652.83%, high-density urbanization expanded by 111.58%, and low-density urbanization increased only between 1986 and 2005—expansion that came at the expense of natural grassland, herbaceous parks, and livestock land. The authors conclude this reflects a regional process of urban growth and productive intensification that has caused losses of open-field horticultural areas and produced a non-equitable distribution of remaining semi-natural areas, and they call for territorial planning that prioritizes ecologically resilient, semi-natural land cover.

Ibrahima Saidou · Journal of Environmental Science and Allied Research · Cameroon (Yaoundé)

A 2014 study in Yaoundé, Cameroon, surveyed 40 farmers and analyzed soil in two valley bed suburbs, Nkolodom and Nkolbisson, to identify soil constraints on urban agriculture. While nitrogen and phosphorus levels were adequate, soil salinity at Nkolodom was brackish to moderate (810 mS/m), potentially constraining crop growth. Soil fertility was also found to decrease with distance from farmers' houses.

Delphine Bernadette Ouédraogo, Delwendé Innocent Kiba, Zacharia Gnankambary, Sheick K. Sangaré, Diakouba Sirima, Hassan Bismarck Nacro, Michel Papaoba Sédogo · Journal of Agricultural Science · Burkina Faso (Ouagadougou)

This study investigated cropping practices and their drivers in 133 peri-urban farms near Ouagadougou, Burkina Faso. Soil sample analysis revealed that monoculture led to low soil organic carbon, while polyculture led to low soil available potassium. The socio-economic conditions of the farms explained up to 60% of the variability in cropping practices.

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.

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.

E.N. Sabiiti, Constantine Bakyusa Katongole · Water science and technology library · Uganda

Wakiso district, the peri-urban area surrounding Kampala, Uganda's capital city (population about 1.51 million), ranks first nationally in poultry production and second in pig production, accounting for 7.4% and 6.3% of the national chicken and pig populations respectively. The chapter finds that agricultural land in these peri-urban areas is increasingly at risk from urban encroachment, driven by population growth, distorted land values, a construction boom, and expanding recreation and leisure facilities competing with farming for land, which is likely to adversely affect the city's food security.

Eric Weaver · Suburban Sustainability · Global

This review details the relationship between key planetary systems and the many adverse impacts of industrial agriculture, drawing from top-tier journals. Research indicates that industrial agriculture is a major force pushing environmental limits, with multinational corporations continuing to influence national environmental regulations. Current literature debates whether political systems can institute sustainable solutions, suggesting that grassroots efforts may be the most viable solution to displace the industrial agriculture model.

Leonia John Raphael · Tanzania Journal for Population studies and Development · Tanzania (Dar es Salaam)

A 2015 study in Dar es Salaam, Tanzania, found that extreme climatic changes, including rainfall and temperature, have adversely affected peri-urban agricultural productivity and vegetation cover. Excessive rains lead to the destruction of urban gardens, vegetation, property, and loss of livelihoods for urban dwellers, 87% of whom are rural migrants. This highlights significant risks for urban communities dependent on land resources in rapidly growing cities.

Danfeng Huang · Journal of Changjiang Vegetables · Global

This paper discussed the importance of intensive vegetable production in urban agriculture, highlighting its role in guaranteeing the supply, quality, and safety of fresh vegetables. It summarized key aspects of intensive production, including industrialized seedling production, facility production, efficient cultivation, postharvest processing, and commercial management, but also presented environmental problems and restricting factors in the development of intensive vegetable production.

Ruth Stewart, Marcel Korth, Laurenz Langer, Shannon Rafferty, Natalie Rebelo Da Silva, Carina van Rooyen · Environmental Evidence · Global

This is a systematic review protocol — not a completed review — that sets out methods for identifying, appraising and synthesizing evidence on how urban agriculture programs affect food security and nutrition in low- and middle-income countries. It notes urban agriculture is widely promoted as providing the urban poor with food and income while improving the urban environment, but also carries potential disadvantages: use of wastewater can contaminate produce, intensive irrigation can spread malaria and water-borne disease and strain limited water supplies, and soil erosion and intensive fertilizer/pesticide use can pose health risks and environmental damage. Despite the current policy drive to promote urban agriculture, the paper states that the evidence base for its benefits and harms is not well understood. As a protocol, it reports planned search, screening, bias-appraisal and synthesis methods rather than results.

Brian Halweil · · Global

This book points out that the long-distance food system consumes staggering amounts of fuel, generates greenhouse gases, and compromises food security. Since 1961, the tonnage of food shipped between nations has grown fourfold, with food in the United States typically traveling 1,500 to 2,500 miles from farm to plate. While this system often runs roughshod over local cuisines, varieties, and agriculture, a local-foods movement is beginning to emerge globally.