Research & reports

Intergovernmental Panel on Climate Change (IPCC) · IPCC Working Group III, Sixth Assessment Report (AR6) · Global

This annex to the IPCC AR6 Working Group III report defines GWP100 (100-year global warming potential) values, units, and conventions. Methane's GWP100 differs by source: 27 for biogenic methane and fossil methane from combustion, and a higher 29.8 for fossil methane from fugitive and process sources.

David Pearlmutter, Bernhard Pucher, Cristina Sousa Coutinho Calheiros, Karin A. Hoffmann, Andreas Aicher, Pedro Pinho, Alessandro Stracqualursi, Alisa Koroļova, Alma Pobrić, Ana Galvão, Ayça Tokuç, Bilge Baş, Dimitra Theochari, Dragan Milošević, Emanuela Giancola, Gaetano Bertino, Joana Castellar, Julia Flaszynska, Makbulenur Onur, Mari Carmen Garcia Mateo, Maria Beatrice Andreucci, Maria Milousi, Mariana Fonseca, Sara Di Lonardo, Veronika Gežík, Ulrike Pitha, Thomas Nehls · Water · Global

This paper proposes a new paradigm for closing urban water cycles using nature-based solutions, specifically green roofs and vertical greening systems (VGS). Simulations of VGS evapotranspiration performance in six cities (Copenhagen, Berlin, Lisbon, Rome, Istanbul, Tel Aviv) showed that VGS could recycle 44% (Lisbon) to 100% (Berlin, Istanbul) of rainwater roof runoff, with greywater bridging dry month shortages. Additionally, 27–53% of building greywater could be managed on greened surfaces.

K. Wróblewska, Byoung Ryong Jeong · Environmental Sciences Europe · Global

This review presents the effectiveness of plants and green infrastructure in ambient particulate matter (PM) removal. It describes the mechanisms of PM capture by plants and factors influencing PM reduction in the atmosphere. The review refers to the effectiveness of plant utilization in various forms of green infrastructure, including trees, grasslands, green roofs, living walls, water reservoirs, and urban farming. Additionally, methods to increase PM removal by plants, such as species selection, biodiversity increase, PAH-degrading phyllospheric endophytes, transgenic plants, and microorganisms, are presented.

Tolessa Deksissa, Harris B. Trobman, Kamran Zendehdel, Hossain Azam · Sustainability · Global

This study reviews literature on integrating urban agriculture (UA) and stormwater green infrastructures (GIs) within a circular economy framework. It explores how cities can combine these developments to overcome barriers and enhance ecosystem services. The findings indicate that integrating UA with GIs can improve urban food production while simultaneously protecting urban water quality.

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.

Alba Canet-Martí, Rocío Pineda‐Martos, Ranka Junge, Katrin Bohn, Teresa A. Paço, Cecília Delgado, Gitana Alenčikienė, Siv Lene Gangenes Skar, Gösta F. M. Baganz · Water · Global

This paper examines nature-based solutions (NBS) for urban agriculture (UA) in circular cities, focusing on input/output streams. It identifies that the understanding of I/O streams for different NBS is insufficient to fully leverage their potential for strengthening circularity in UA. The study pinpoints gaps that hinder UA's development as an opportunity within the Circular City framework, emphasizing the need for a broader understanding of food-related urban streams.

Sumita Ghosh · · Global

This research conducted a desktop review and analyzed six international case studies of rooftop urban farms, community gardens, and home gardens. The analysis found that productive landscapes already exist on city rooftops, contributing positively to community, environment, ecology, economy, and society. Planning and designing rooftop gardens in dense urban areas could foster place-making through urban agriculture.

Carlos Tapia, Linda Randall, Shinan Wang, Luciane Aguiar Borges · Sustainable Cities and Society · Denmark (Aarhus)

This study presents a novel indicator-based evaluation framework for urban agriculture, tested in Fællesgartneriet Brabrand, a community garden in Aarhus, Denmark. The framework aims to capture the contribution of gardening practices to urban sustainability, acknowledging that urban agriculture may also have social and environmental externalities depending on prevalent farming practices.

Susana Toboso‐Chavero, Cristina Madrid‐López, Gara Villalba, Xavier Gabarrell, Arne Björn Hückstädt, Matthias Finkbeiner, Annekatrin Lehmann · The International Journal of Life Cycle Assessment · Global

A comprehensive environmental and social life cycle assessment of perlite, peat, and coir growing media, imported to Spain from Turkey, Germany, and the Philippines respectively, was conducted for urban rooftop farming. Environmentally, coir had the lowest burden, while perlite had the highest impacts due to mining and transport. Socially, peat performed best, but coir showed the worst scores in community infrastructure and human rights, and perlite performed lowest in health and safety.

Fatima Haque, Rafael M. Santos, Yi Wai Chiang · Environmental Science & Technology · Global

This viewpoint article proposes incorporating enhanced rock weathering (ERW) into urban farming as an additional climate stabilization measure. Urban farming utilizes extensive urban surface areas for food production and atmospheric CO2 sequestration through air-to-soil contact. Combining this with ERW offers a further opportunity for this negative emissions technology to gain greater utilization.

Diana Maria Reyes Avalo, Misterbino Borgès Garcìa · DOAJ (DOAJ: Directory of Open Access Journals) · Cuba (Jiguaní)

This study in Jiguaní municipality, Granma province, Cuba, aimed to enhance the sustainable production and diversification of yam cultivation under agricultural drought conditions using biotechnological seeds. The accelerated yam seed production technology, combining biotechnological and conventional methods, was implemented in urban, suburban, and family agriculture. This led to the successful implementation of certified yam seed technology, increasing plant numbers from 2000 to 6000 in 2018 for a total area of 0.6 ha, and contributing to local development.

Hayley Q McGough · DigitalCommons - CalPoly (California State Polytechnic University) · Global

This paper investigates why plant façades on buildings frequently die, preventing them from fully realizing benefits like urban heat island reduction and improved air quality. Through interviews with landscape architects, it examines factors for maintaining plant façades and assesses if new approaches, such as earlier integration of landscape architects or biocurtains, can address the high mortality rates. The study highlights that these plant façades often fail, leading to waste and unfulfilled potential.

Yang Deng · Journal of Hazardous Materials Letters · Global

While rainwater harvesting (RWH) is considered a sustainable irrigation method for urban agriculture, contaminants in rainwater pose challenges to RWH practices due to potential threats to crop, soil, and human health. Based on literature data, principal pollutants such as particles, toxic metals like cadmium, copper, and zinc, synthetic organic chemicals like agrochemicals and polycyclic aromatic hydrocarbons, and waterborne pathogens were identified as likely exceeding irrigation quality criteria. This study identifies challenges, knowledge gaps, and research needs for RWH irrigation, offering a basis for technical strategies.

Fábio Suzart de Albuquerque, Heather L. Bateman, Cameron Scott Boehme, Daniel C. Allen, Luis Cayuela · Land · Global

This study investigated the effects of land-use and land-cover (LULC) types, vegetation greenness, and climate on avian seasonal variation abundance and richness in urban desert ecosystems, using avian community data collected seasonally (winter and spring) from 2001 to 2016. Generalized linear mixed models (GLMM) indicated that LULC was the most important predictor of avian abundance and richness. Avian abundance was highest in urban riparian and urban LULC types, followed by agriculture. Avian richness was highest in riparian environments (urban and desert), followed by agriculture, urban, and desert.

Lifei Xi, Mengyuan Zhang, L. Zhang, Tedrick Thomas Salim Lew, Yeng Ming Lam · Advanced Materials · Singapore

This review discusses how novel materials are crucial for advancing urban farming, offering benefits like controlled release of nutrients, improved seed health, and better water retention in substrates. Singapore is presented as an example where urban farming, supported by materials science, can address food production challenges in land-scarce cities. The paper highlights potential research directions and challenges in the field.

Leandro Pessoa Lucena, Fernanda Mariano Massuia · urbe Revista Brasileira de Gestão Urbana · Singapore

This post-doctoral research investigated the evolution and impacts of urban agriculture models in Singapore as public policy for sustainability, food security, and ecological economy. The study used bibliographic investigations and field research at high-tech soilless urban farms to estimate CO₂ emission reductions from modern urban agriculture. Results showed Singapore intensively uses urban agriculture, including vertical, indoor, and rooftop farms, all demonstrating technological innovations, high productivity, organic certification, and contributions to CO₂ emission reduction.

Masato Kobiyama, Karla Campagnolo, Marina Refatti Fagundes · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Global

This study briefly evaluated the history of institutional and scientific aspects of hydrology, noting its increasing proximity to society and focus on urban areas. It revisited the concept of "ruralization of urban areas," proposed in 2000, from hydrological, philosophical, and applied practice perspectives. Ruralization actions like urban storage, rainwater harvesting, and urban agriculture were detailed, emphasizing their implementation with data from school-basins.

Susana Toboso‐Chavero, Gara Villalba, Xavier Gabarrell, Cristina Madrid‐López · Journal of Industrial Ecology · Global

This study developed an integrated framework for designing sustainable roof mosaic scenarios, combining urban farming, solar energy, and rainwater harvesting on unused rooftops of housing estates. Applied to a 66,433 m² rooftop area, the framework involved multi-scale and multi-dimensional analysis. Five participatory-designed rooftop scenarios were found to improve residents' resource self-sufficiency, providing 42–53% of vegetable consumption, 9–35% of electricity, and 38–200% of water needs, depending on the scenario.

Fatiha Hakimi · Journal of Analytical Science & Technology · Morocco (Rabat)

This study assessed the practices, roles, and challenges of peri-urban farming in the metropolis of Rabat, Morocco, surveying 50 respondents. Peri-urban agriculture is a multifunctional activity contributing to job creation, income generation, food supply, and environmental beautification. However, it faces several constraints, including precarious and costly labor, absence of regulating laws, lack of training and technical supervision for peri-urban farmers, and water resource shortages.

Femke Beute, Maria Beatrice Andreucci, Annamária Lammel, Zoe G. Davies, Julie Glanville, Hans Keune, Melissa Marselle, Liz O’Brien, Agnieszka Olszewska-Guizzo, Roy Remmen, Alessio Russo, S. de Vries · Research Repository (University of Gloucestershire) · Global

This paper discusses the role of diverse urban green spaces, such as urban forests, parks, and urban farming locations, in the mental and physical health of urban residents. It notes that green spaces vary in characteristics like scenic beauty and vegetative composition. The paper highlights that urbanization and climate change are pressuring urban green spaces, necessitating in-depth knowledge on how different green space types and characteristics influence mental health for informed design and planning.

Ayako Nagase, Jeremy Lundholm · Journal of Living Architecture · Global

This review elucidates potential ecosystem services provided by container gardening, which are used in cities globally where access to soil is limited. The services include food production, stormwater management, air quality improvement, energy savings, thermal comfort, plant biodiversity, creation of animal habitats, aesthetic value, communication, and environmental education. The review aims to recognize the value of container gardens to promote them as part of green infrastructure in urban areas.

Daniel Petrovics, Mendel Giezen · Journal of Environmental Planning and Management · Global

This research analyzes contextual conditions for vertical farming (VF) in the Global North to assess its up-scaling potential for sustainability, particularly climate mitigation, using the Multi-Level Perspective. Findings indicate that singular VF interventions require integrated functions for viability, and VF offers the most climate mitigation potential when viewed through urban-level systemic food planning. The study also notes that globalized neoliberal political economy dynamics have implications for VF up-scaling policy.

Luuk Graamans · Architecture and the Built Environment · Global

This research investigated the potential and limitations of plant factories (vertical farming) for urban food production. The STACKED method was developed to assess plant factory performance across multiple scales, from leaf to facility to city, analyzing resource requirements including energy, electricity, water, CO2, and land area use for fresh vegetable production. The study found that while plant factories feature extensive climate control, their necessity, effectiveness, and efficiency remain questionable, and their effects on the urban energy balance were also assessed.

Miguel A. Altieri, Clara I. Nicholls · Magna Scientia UCEVA · Global

This reflection explores agroecology as a sustainable development alternative for a post-COVID-19 agricultural system, revitalizing peasant agriculture and enhancing urban agriculture. An agroecology-based system can minimize future food supply disruptions by improving links between small-scale food production and local consumption. Agroecology is presented as a strategy for autonomy and resilience, addressing global challenges like climate change and food insecurity.

Ralitsa Hiteva · · Bulgaria (Sofia)

This chapter examines fuel poverty in Sofia, Bulgaria, as part of the urban nexus of food, water, energy, and environment. It uses urban gardening, making zimnina (preserved food), and domestic heating/energy use as case studies to illustrate how these practices are interdependent and impact energy provisioning. The study focuses on low-technological ways of managing the urban nexus from the perspective of vulnerable users, aiming to address fuel poverty and air pollution.