Research & reports

Taufik Zarkasya Sastrawinata, Ilhamdaniah, Agara Dama Gaputra · Prosiding Temu Ilmiah · Indonesia

A report on an apartment design project — a final-year architecture thesis at UPI — sited at Bandung Teknopolis within the Summarecon Bandung residential development in West Java, Indonesia. Located in a tropical climate, site analysis found that most of the solar exposure received from 9am to 5pm, east to west, was disadvantageous. The design applies sustainable landscaping, sun shading, cross ventilation, renewable energy through photovoltaic panels, an alternative water source via rainwater harvesting, and urban farming, with an environmental focus as the project's central sustainability strategy.

Maureen Hartwell · Environmental Claims Journal · United States

This commentary examines Climate Action Plans (CAPs) that US municipalities have produced for more than thirty years, from a land-use law perspective. It notes that early CAPs often contained detailed but unaccountable, metric-free aspirations, whereas more recent CAPs have grounded themselves in land use law by integrating into comprehensive plans, amending zoning codes to meet urban agriculture goals, and offering expedited zoning procedures for CAP-compliant developers.

Devisri S.S. Senthilkumar, Moumita Malakar · Climate Change and Environmental Sustainability · India

This review examines "public gardens" — green spaces holding diverse plant collections for public enjoyment, education, and biodiversity conservation — as a potential option for climate change hazard mitigation, drawing on recent built-environment interventions in non-agriculture-based rural cities in India that use urban gardening. It notes a deficit in public awareness and understanding of climate information and governance systems, including technical knowledge, and compiles knowledge on how urban gardening approaches feature in climate change programs that seek to legalize green infrastructure implementation.

Poonam Bewtra · Current Agriculture Research Journal · India

Food forests involve planned agroforestry. The abstract states that, like a real forest, a food forest requires no pesticides, herbicides, weeding, crop rotation, mowing, or digging, and ensures the sustainability of flora, fauna, birds, animals, and particularly bees. This is a case study of one such food forest, Vanya Organic, realized by one of its owners, Mr. Patanjali Jha, who grew native trees, creepers, and shrubs in combination with symbiotic vegetation to maximize carbon sequestration, forest cover, and usable by-products. A key component is Vetiver grass, and Jha argues that food forests and vetiver plantations should be planned and established together, terming the combination a "Regenerative Food Forest." The abstract states that Compressed Bio Gas (CBG) or Renewable Natural Gas (RNG), described as a "green fuel," can be derived from the agricultural waste and other biomass that regenerative food forests produce in abundance; a CBG plant produces sulphur-stripped, automotive-grade methane along with a high-quality organic fertilizer by-product approved for regular use by the Ministry of Agriculture, and the abstract argues for linking CBG plants with regenerative food forests to provide jobs, increase farm incomes, and bring sustainable changes to air, water, and soil quality over time. The case study is stated to have been prepared with the owner's consent and approval.

Arun Kafle, James Hopeward, Baden Myers · Horticulturae · Global

A study modeling the social, economic, and environmental potential of urban agriculture (UA), based on information from 40 distinct locations in each of two regions: Adelaide, South Australia and the Kathmandu Valley, Nepal. Modelling estimated equivalent employment, scale appropriateness, and earnings relative to labor use from commercial urban farming and gardening-style UA, together with carbon dioxide emissions for two vegetable types. The study examined the influence of distance and production scale under manual-to-modest mechanization for urban vegetable production, finding that the interplay between labor use and mechanization can favor scale-appropriate UA practices with better labor productivity and economic and social advantage. Distribution — assumed to be by car for UA — contributed the largest share of emissions, while the production component, even with mechanization, contributed a relatively small portion per unit of production. The study recommends that governments and planners facilitate scale-appropriate mechanization through better planning and policy instruments to support UA's sustainability.

Fan Xu, Fangke Xu, Pu Xu, Min Liu, Yufeng Li · Sustainability · China

A study of 106 questionnaire responses from new urban agricultural business entities in Shanghai, China (Sustainability, 2023) combined the Theory of Planned Behavior with the Motivation-Opportunity-Ability model and a binary Probit regression to examine online sales intentions and behavior for low-carbon agricultural products. Economic expectations and social norms significantly improved online sales intention at the formation stage, while behavior control was found not to be conducive to improving online sales intention. The study also identified a gap between operators' willingness to sell online and their actual behavior, and found that strengthening policy conditions and management capacity helped convert stated willingness into actual online-selling behavior.

Amy Hui‐Mei Lin, Andrea Gómez‐Maqueo · Frontiers in Sustainable Food Systems · Global

A review paper (2023) examines the challenge of strengthening food security — especially production of staple food carbohydrates — in places with limited or unavailable land and natural resources, using the city-state of Singapore as its case. Unlike some alternative foods such as cultured meat, producing carbohydrate foods through conventional agri-food approaches requires substantial natural resources unavailable in regions like Singapore, so the paper argues for developing new, sustainable methods to increase the quantity and nutritional quality of carbohydrate-rich foods. It reviews technology developments such as indoor vertical farming and urban farming used to improve crop quality and production, and recommends exploring underutilized and unconventional resilient, nutrient-dense crops, identifying hidden resources in local ecosystems such as revalorizing agri-food processing byproducts, and producing alternative carbohydrates including microbial and synthetic sources, suggesting Singapore's experience and approaches may serve as an example and inspire creativity for other regions.

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.

Mahsa Tarashkar, Mansour Matloobi, Salman Qureshi, Akbar Rahimi · Ecological Indicators · Global

This study investigated the effects of tea waste compost on the growth traits of radish (Raphanus sativus L.) and explored whether a clean carbon dioxide source from urban households could contribute to sustainable production. Tea waste gathered from urban households was decomposed for four months and mixed at 0–75% by volume with loamy garden soil; using a split-plot design, one greenhouse was enriched to an elevated CO2 concentration of 1500±100 ppm while a second was kept at the ambient level of 500±20 ppm. Results showed that elevated CO2 negatively affected radish yield, biomass accumulation, and vegetative growth parameters, while increasing volumes of tea waste compost, up to 75%, improved growth traits. At 75% tea waste compost, elevated CO2 had the same effect on growth traits as the normal level, showing a positive effect on total fresh weight but negative effects on total dry weight, leaf dry weight, and total leaf area. The study attributes the strongest support for radish growth at the highest compost volume (75%) to its high nitrogen content.

Ilham Nur Hanifan Maulana, Ahmad Herlyasa Sosro Pratama, Sukardi Sukardi, Handayani Nurhayati, Della Agustina Putri, Tasya Fiane Wardah · Ecoplan · Indonesia

A qualitative case study using a literature review (via Mendeley, Zotero and Google Scholar) examined variations in how urban farming is applied to sustain food security in Malang City, Indonesia, an area facing high housing demand and land shortages. It found that urban farming can strengthen household food security, that motivation to farm, human resource capacity, and community participation are important factors in boosting self-reliant economic empowerment, and that vertical hydroponic "superblocks" have become a popular urban-farming cultivation method.

Ayşegül YARIŞ, Emel Karakaya Ayalp · · Africa

This article reviews the City-Region Food System (CRFS) approach and toolkit developed by FAO and RUAF, translated into Turkish, and examines its roadmap through the West African cities of Ouagadougou and Tamale to assess applicability for building sustainable urban food systems. The review concludes that the CRFS Toolkit offers a limited set of tools and does not incorporate the relationship with spatial disciplines.

Mark A. Goddard, Helen Glanville, Carla Comadran‐Casas, M. Ehsan Jorat, David A.C. Manning, Miranda T. Prendergast‐Miller, Kevin Stott · · Global

A book chapter on the role of soil within urban blue-green infrastructure (BGI). It outlines the characteristics of urban soils and their contribution to ecosystem services such as food production, flood mitigation, carbon storage and recreation, and discusses challenges and opportunities in managing and creating soils within urban BGI. The chapter closes with land-use-specific management recommendations and a call for greater recognition of urban soils in planning policy. It is a review/discussion chapter and reports no original data, study site or measurements.

Maria Korkou, Ari K.M. Tarigan, Hans Martin Hanslin · Urban forestry & urban greening · Global

A systematic literature review examines the multifunctionality concept in urban green infrastructure planning, identifying a knowledge gap in the planning literature regarding multiple ecosystem functions and a lack of methods for quantifying and monitoring ecological services and biodiversity at different spatial scales. The reviewed literature clustered into five main themes — planning methods for urban green infrastructure, assessment approaches, ecosystem services and their benefits, sustainability and climate adaptation, and urban agriculture — which the review found were interconnected. It identifies a knowledge gap in incorporating multifunctional green infrastructure into planning principles and proposes five critical elements for ensuring multiple functions: spatial distribution, optimal distance, integrated network, accessibility, and public participation and engagement.

Laura Ospina, Paula Parra · Pensamiento udecino · Colombia

A documentary literature review examines the importance of urban agriculture, urbanization and community participation in the context of community gardens in Colombia. It draws on high-quality scientific texts from portals including Scielo, Publindex and Scopus, plus undergraduate, master's and doctoral theses, along with a review of statistical data for each variable studied. The results point to social, economic and environmental implications and the importance of participation in these spaces. The review concludes that urban gardens are a strategy that can offset negative externalities of the current capitalist urban model -- environmental degradation, pollution, poverty, inequality -- and can positively affect residents' quality of life, becoming consolidated as spaces linking social and environmental concerns and enabling new territorial configurations.

Tibisay Pérez, Sintana E. Vergara, Whendee L. Silver · Scientific Reports · United States

Continuous micrometeorological mass-balance measurements of greenhouse gas emissions from commercial-scale windrow food-waste composting found emission factors of 6.6–8.8 kg CH4–C and 0.01 kg N2O–N per Mg of wet food waste, for a combined emission factor of 926 kgCO2e per Mg of dry food waste. Composting emissions were 38–84% lower than equivalent landfilling, with a projected minimum net savings of 1.4 MMT CO2e for California by 2025.

Cole Rosengren · Waste Dive · United States

California's Little Hoover Commission recommended pausing SB 1383, the state's organics recycling law, citing concern the state will miss its 2025 targets, but CalRecycle, industry and environmental advocates strongly opposed the pause, noting roughly $500 million already invested. 445 of 614 jurisdictions now have residential food-waste collection programs, and waste costs rose 20% for residential and 30% for commercial customers.

Li Jiacheng · Eco-Business / Dialogue Earth · China

China's mandatory waste-sorting policy, launched in Shanghai in 2019, improved diversion and recycling but created a new problem: overbuilt waste-to-energy incineration capacity. Shanghai diverted 54% of its waste (6.46 million tonnes) in 2021, up from 21% in 2018, while the number of national incinerators grew from 130 in 2011 to 927 by 2023, pushing 2022 national overcapacity to 100.99%.

U.S. Environmental Protection Agency (EPA) · U.S. Environmental Protection Agency, Office of Research and Development · United States

An EPA report that for the first time quantifies methane emissions attributable to food waste in U.S. municipal solid waste landfills from 1990 to 2020 (EPA-600-R-23-064). In 2020, food waste was responsible for about 55 million metric tons CO2e of landfill emissions and accounted for 58% of fugitive methane emissions from MSW landfills. Because food waste decays quickly, 50% of its carbon degrades within 3.6 years, often before gas collection systems are installed.

U.S. Environmental Protection Agency (EPA) · U.S. Environmental Protection Agency, Office of Research and Development · United States

This EPA report (October 2023, EPA-600-R-23-065) introduces the 'Wasted Food Scale,' a new ranking of eleven food waste management pathways from most to least environmentally preferable, replacing the 1990s 'Food Recovery Hierarchy.' It finds source reduction, donation, and upcycling most preferable, and that sewer/wastewater treatment and landfill stand out for their sizeable methane emissions.

国土交通省 · 国土交通省 · Japan

According to this December 11, 2023 announcement by Japan's Ministry of Land, Infrastructure, Transport and Tourism, approximately 15.6 hectares of green roofs and 4.4 hectares of green walls were newly installed nationwide in FY2022. Cumulative installations from FY2000 through FY2022 (23 years) reached about 597 hectares of green roofs and 119 hectares of green walls (FY2021 and FY2022 figures are provisional).

Joshua Newell, Alec Foster, Mariel Borgman, Sara Meerow · Cities · United States (Detroit)

A study in Detroit's Lower Eastside (~15 sq. miles) examined the spatial extent, characteristics, and residents' perceptions of urban gardens using spatial analysis and interviews. Gardens covered less than 1% of vacant land and were often ephemeral. Primary obstacles to scaling up urban agriculture in Detroit include uncertainty over land tenure, environmental pollutants, potential ecosystem disservices, and a lack of government support and capital investment.

Nitya Rao, Sheetal Patil, Chandni Singh, Parama Roy, Charles Pryor, Prathigna Poonacha, Mariam Genes · Sustainable Cities and Society · Global

This systematic literature review analyzed 320 articles quantitatively and 86 qualitatively from a total of 4029, examining outcomes of urban and peri-urban agriculture (UPA) on sustainability and wellbeing. The review confirmed an exponential increase in UPA literature since 2015 and a regional bias towards the Global North. It identified six thematic outcomes across environmental, economic, and social sustainability pillars, with environmental sustainability being most discussed and gender and social differentiation least represented.

Andrea Fantini · Agroecology and Sustainable Food Systems · Global

This paper analyzes the functions of urban and peri-urban agriculture (UPA) as a strategy for sustainable and resilient urban food systems and for coping with global emergencies. It identifies various functions of UPA and how they connect, but also discusses obstacles to its large-scale implementation. The paper highlights that despite its potential, significant barriers hinder UPA's widespread adoption.

Aleksandra Nowysz, Łukasz Mazur, Magdalena Daria Vaverková, Eugeniusz Koda, Jan Winkler · International Journal of Environmental Research and Public Health · Global

This study explored urban agriculture (UA) as an alternative source of food and water security, employing a mixed-method approach including literature survey, case studies, and comparative analysis. It compared 25 existing projects in the global north, including allotment gardens, community gardens, and urban farms, categorizing UA into architectural-urban, ecological, social, and economic aspects. The analysis concluded that UA fulfills economic, social, and environmental functions, aligning with the concept of sustainable development.

Karen Lourdes, Perrine Hamel, Chris Gibbins, Ruzana Sanusi, Badrul Azhar, Alex M. Lechner · Landscape and Urban Planning · Malaysia

This study characterized the spatial distribution of multiple urban ecosystem services (UES) in a rapidly urbanizing catchment in Greater Kuala Lumpur, Malaysia, and developed a systematic approach to integrate UES into green infrastructure (GI) planning. Using InVEST models to spatially quantify and map six UES (heat mitigation, runoff retention, sediment retention, scenic quality, urban recreation, and agricultural production), the assessment revealed that densely built areas generally had low UES provision. A multicriteria analysis identified locations for five GI strategies: conservation of headwaters, reforestation for biodiversity, development and conservation of urban parks, and greening of built infrastructure.