Would a Sustainable City Be Self-sufficient in Food Production?

Would a Sustainable City Be Self-sufficient in Food Production?

Gaston E. Small Robert Mcdougall Geneviève Suzanne Metson

Biology Department, University of Saint Thomas, Saint Paul, Minnesota, United States.

School of Environmental and Rural Sciences, University of New England, Armidale, NSW, Australia.

Department of Physics, Chemistry, and Biology (IFM), Linköping University, Linköping, Sweden.

Available online: 
| Citation



Urban agriculture has increased in many cities and has the potential to provide an array of benefits including increased local food production, nutrient recycling, urban green space, and biodiversity. While certain environmental benefits of urban agriculture are evident, it is not clear what the optimal extent of urban agriculture would be in designing a sustainable city. Closing the loop by recycling waste products into new resources is fundamental to sustainability, but the extent to which this should occur at local, regional, or global scales is an open question. We analyze how potential benefits and costs associated with urban agriculture scale with the extent of implementation, and compare potential tradeoffs in different metrics of sustainability. We assess how the appropriate metrics to optimize in a given city are context-dependent. For example, maximizing production in a small land footprint could be important in densely developed urban environments, whereas filling vacant land with food-producing gardens may be a more appropriate goal in certain post-industrial cities. We assess the potential role that urban agriculture plays in making urban food systems more resilient to climate change and other disruptions. Finally, we consider a case study comparing the resources required and pollution generated to produce the lettuce supply of on U.S. metropolitan area through outdoor urban agriculture and indoor urban agriculture, compared to conventional production and cross-continental transportation. This analysis illustrates the importance of considering multiple metrics in assessing sustainability of urban agriculture. 


cost-benefit analysis, sustainability, resilience, trade-offs, urban agriculture


[1] Burger, J.R., Allen, C.D., Brown, J.H., Burnside, W.R., Davidson, A.D., Fristoe, T.S., Hamilton, M.J., Mercado-Silva, N., Nekola, J.C., Okie, J.G. & Zuo, W., The macroecology of sustainability. PLoS Biol, 10(6), p. e1001345, 2012. https://doi.org/10.1371/ journal.pbio.1001345

[2] Rees, W. & Wackernagle, M., Urban ecological footprints: Why cities cannot be sustainable–and why they are a key to sustainability. Environmental Impact Assessment Review, 16(4–6), pp. 223–248, 1996. https://doi.org/10.1016/s0195-9255(96)00022-4

[3] Weber, C.L. & Matthews, H.S., Quantifying the global and distributional aspects of American household carbon footprint. Ecological Economics, 66(2–3), pp. 379–391, 2008. https://doi.org/10.1016/j.ecolecon.2007.09.021

[4] Rothwell, A., Ridoutt, B., Page, G. & Bellotti, W., Environmental performance of local food: trade-offs and implications for climate resilience in a developed city. Journal of Cleaner Production, 114, pp. 420–430, 2016. https://doi.org/10.1016/j. jclepro.2015.04.096

[5] Born, B. & Purcell, M., Avoiding the local trap: Scale and food systems in planning research. Journal of Planning Education and Research, 26(2), pp. 195–207, 2006. https://doi.org/10.1177/0739456x06291389

[6] Nogeire-McRae, T., Ryan, E.P., Jablonski, B.B.R., Carolan, M., Arathi, H.S., Brown,C.S., Saki, H.H., McKeen, S., Lapansky, E. & Schipanski, M.E., The role of urban agriculture in a secure, healthy, and sustainable food system. BioScience, 68, pp. 748–759, 2018. https://doi.org/10.1093/biosci/biy071

[7] Harrison, J.L., Pesticide Drift and the Pursuit of Environmental Justice, MIT Press, 2011.

[8] Goddard, M.A., Dougill, A.J. & Benton, T.G., Scaling up from gardens: Biodiversity conservation in urban environments. Trends in Ecology and Evolution, 25, pp. 90–98, 2010. https://doi.org/10.1016/j.tree.2009.07.016

[9] Susca, T., Gaffin, S.R. & Dell’Osso, G.R., Positive effects of vegetation: urban heat island and green roofs. Environmental Pollution, 159(8–9), pp. 2119–2126, 2011. https://doi.org/10.1016/j.envpol.2011.03.007

[10] Armstrong, D., A survey of community gardens in upstate New York: Implications for health promotion and community development. Health Place, 6(4), pp. 319–327, 2009. https://doi.org/10.1016/s1353-8292(00)00013-7

[11] de Zeeuw, H.R., Veenhuizen, V. & Dubbeling, M., The role of urban agriculture in building resilient cities in developing countries. Journal of Agricultural Science, 149(S1), pp. 153–163, 2011. https://doi.org/10.1017/s0021859610001279

[12] Mincyte, D. & Dobernig, K., Urban farming in the North American metropolis: rethinking work and distance in alternative food networks. Environment Planning A: Economy and Space, 48, pp. 1767–1786, 2016. https://doi. org/10.1177/0308518x16651444

[13] McClintock, N., Why farm the city? Theorizing urban agriculture through a lens of metabolic rift? Cambridge Journal of Regions Economy and Society, 3(2), pp. 191–207, 2010. https://doi.org/10.1093/cjres/rsq005

[14] Turner, B., Embodied connections: Sustainability, food systems and community gardens. Local Environment, 16(6), pp. 509–522, 2011. https://doi.org/10.1080/1354 9839.2011.569537

[15] Frumkin, H., Healthy places: Exploring the evidence. American Journal of Public Health, 93, pp. 1451–1456, 2003. https://doi.org/10.2105/ajph.93.9.1451

[16] Goodman, W. & Minner, J., Will the urban agricultural revolution be vertical and soilless? A case study of controlled environment agriculture in New York City. Land Use Policy, 83, pp. 160–173, 2019. https://doi.org/10.1016/j.landusepol.2018.12.038

[17] Turner, W., Nakamura, T. & Dinetti, M., Global urbanization and the separation of humans from nature. BioScience, 54(6), p. 585, 2004. https://doi.org/10.1641/0006- 3568(2004)054[0585:guatso]2.0.co;2

[18] McCormack, L.A., Laska, M.N., Larson, N.I. & Story, M., Review of the nutritional implication of farmers’ markets and community gardens: A call for evaluation and research efforts. Journal of the American Dietetic Association, 110(3), pp. 399–408, 2010. https://doi.org/10.1016/j.jada.2009.11.023

[19] Boeing, H., Bechthold, A., Bub, A., Ellinger, S., Haller, D., Kroke, A., Leschik-Bonnet, E., Muller, M.J., Oberritter, H., Shulze, M., Stehle, P. & Watzl, B., Critical review: Vegetables and fruit in the prevention of chronic diseases. European Journal of Nutrition, 51(6), pp. 637–663, 2012. https://doi.org/10.1007/s00394-012-0380-y

[20] Joye, Y., Architectural lessons from environmental psychology: The case of biophilic architecture. Review of General Psychology, 11(4), pp. 305–328, 2007. https://doi. org/10.1037/1089-2680.11.4.305

[21] Ulrich, R., Evidence-based health-care architecture. Lancet, 368(12), pp. S38–S39, 2006. https://doi.org/10.1016/s0140-6736(06)69921-2

[22] Dimitri, C., Olberholtzer, L. & Pressman, A., Urban agriculture: Connecting producers with consumers. British Food Journal, 118, pp. 603–617, 2016. https://doi.org/10.1108/ bfj-06-2015-0200

[23] Caldeyro-Stajano, M., Simplified hydroponics as an appropriate technology to implement food security in urban agriculture. Practical Hydroponics Greenhouses, 76, pp. 1–6, 2004.

[24] Voicu, I. & Been, V., The effect of community gardens on neighboring property values. Real Estate Economics, 36(2), pp. 241–283, 2008. https://doi.org/10.1111/j.1540- 6229.2008.00213.x

[25] Vitiello, D. & Wolf-Powers, L., Growing food to grow cities? The potential of agriculture for economic and community development in the urban United States. Community Development Journal, 49(4), pp. 508–523, 2014. https://doi.org/10.1093/cdj/bst087

[26] Cleveland, D.A. et al., The potential for urban household vegetable gardens to reduce greenhouse gas emissions. Landscape and Urban Planning, 157, pp. 365–374, 2017. https://doi.org/10.1016/j.landurbplan.2016.07.008

[27] Al-Chalabi, M., Vertical farming: Skyscraper sustainability? Sustainable Cities and Society, 18, pp. 74–77, 2015. https://doi.org/10.1016/j.scs.2015.06.003

[28] Harada, Y., Whitlow, T.H., Walter, M.T., Bassuk, N.L., Russell-Anelli, J. & Schindelbeck, R.R., Hydrology of the Brooklyn Grange, an urban rooftop farm. Urban Ecosystems, 21(4), pp. 673–689, 2018. https://doi.org/10.1007/s11252-018-0749-7

[29] Metson, G.S. & Bennett, E.M., Phosphorus cycling in Montreal’s food and urban agricultural systems. PLoS One, 10(3), p. e0120726, 2015.

[30] Dewaelheyns, V., Elsen, A., Vandendriessche, H. & Gulinck, H., Garden management and soil fertility in Flemish domestic gardens. Landscape and Urban Planning, 116, pp. 25–35, 2013. https://doi.org/10.1016/j.landurbplan.2013.03.010

[31] Small, G., Shrestha, P. & Kay, A., The fate of compost-derived phosphorus in urban gardens. International Journal of Design & Nature and Ecodynamics, 13(4), pp. 415–422, 2018. https://doi.org/10.2495/dne-v13-n4-415-422

[32] Lin, B.B., Philpot, S.M., & Jha, S., The future of urban agriculture and biodiversityecosystem services: Challenges and next steps. Basic and Applied Ecology, 16(3), pp. 189–201, 2015.

[33] Isaacs, R., Tuell, J., Fielder, A., Gardiner, M. M., & Landis, D., Maximising arthropodmediated ecosystem services in agricultural landscapes: The role of native plants, Frontiers in Ecology and the Environment, 7, pp. 196–203, 2009.

[34] Clinton, N., Stuhlmacher, M., Miles, A., Uludere Aragon, N., Wagner, M., Georgescu,M., Herwig, C. & Gong, P., A global geospatial ecosystem services estimate of urban agriculture. Earth’s Future, 6, pp. 40–60, 2018. https://doi.org/10.1002/2017ef000536

[35] Keeler, B.L., Hamel, P., McPhearson, T., Hamman, M.H., Donahue, M.L., Meza Prado,K.A., Arkema, K.K., Bratman, G.N., Brauman, K.A., Finlay, J.C., Guerry, A.D., Hobbie, S.E., Johnson, J.A., MacDonald, G.K., McDonald, R.I., Neverisky, N. & Wood, S.A., Socialecological and technological factors moderate the value of urban nature, Nature Sustainability, 2(1), p. 29, 2019. https://doi.org/10.1038/s41893-018-0202-1

[36] Martelozzo, F., Landry, J.S., Plouffe, D., Seufert, V., Rowhani, P. & Ramankutty, N., Urban agriculture: A global analysis of the space constraint to meet urban vegetable demand. Environmental Research Letters, 9(6), p. 064025, 2014. https://doi. org/10.1088/1748-9326/9/6/064025

[37] Stanhill, G., An urban agro-ecosystem: The example of nineteenth-century Paris. Agro-Ecosystems, 3, pp. 269–284, 1976. https://doi.org/10.1016/0304-3746(76)90130-x

[38] Nixon, P.A. & Ramaswami, A., Assessing current local capacity for agrifood production to meet household demand: Analyzing select food commodities across 377 U.S. Metropolitan Areas. Environmental Science and Technology, 52(18), pp. 10511–10521, 2018. https://doi.org/10.1021/acs.est.7b06462

[39] Grewal, S.S. & Grewal, P.S., Can cities become self-reliant in food? Cities, 29(1), pp. 1–11, 2012. https://doi.org/10.1016/j.cities.2011.06.003

[40] Rodriguez, O., London Rooftop Agriculture: A Preliminary Estimate of Productive Potential, Master Thesis, Cardiff: Welsh School of Architecture, 2009.

[41] Caplow, T., Building integrated agriculture: philosophy and practice. In Urban Futures 2030: Urban Development and Urban Lifestyles of the Future, ed. Heinrich Böll Foundation, Heinrich-Böll-Stiftung, Berlin, Germany, pp. 54–58, 2009.

[42] Kong, A.Y.Y., Rosenzweig, C. & Arky, J., Nitrogen dynamics associated with organic and inorganic inputs to substrate commonly used on rooftop farms. HortScience, 50(6), pp. 806–813, 2015. https://doi.org/10.21273/hortsci.50.6.806

[43] McDougall, R., Kristiansen, P., & Rader, R., Small-scale urban agriculture results in high yields but requires judicious management of inputs to achieve sustainability. Proceedings of the National Academy of Sciences USA, 116(1), pp. 129–134, 2019. https://doi.org/10.1073/pnas.1809707115

[44] Despommier, D., The rise of vertical farms. Scientific American, 301(5), pp. 80–87, 2009. https://doi.org/10.1038/scientificamerican1109-80

[45] Artmann, M. & Sartison, K., The role of urban agriculture as a nature-based solution: A review for developing a systematic assessment framework. Sustainability, 10(6), p. 1937, 2018. https://doi.org/10.3390/su10061937

[46] Ramaswami, A., Boyer, D., Nagpure, A.S., Fang, A., Bogra, S., Bakshi, B., Cohen, E. & Rao-Ghorpade, A., An urban systems framework to assess the trans-boundary foodenergy-water nexus: implementation in Delhi, India. Environmental Research Letters, 12(2), p. 025008, 2017. https://doi.org/10.1088/1748-9326/aa5556

[47] Dmitri, C., Oberholtzer, L. & Pressman, A., Urban agriculture: Connecting producers with consumers. British Food Journal, 118, pp. 603–617, 2016. https://doi.org/10.1108/ bfj-06-2015-0200

[48] Despommier, D., Farming up the city: the rise of urban vertical farms. Trends in Biotechnology, 31(7), pp. 388–389, 2013. https://doi.org/10.1016/j.tibtech.2013.03.008

[49] Cook, R.L. & Calvin, L., Greenhouse tomatoes change the dynamics of the North American fresh tomato industry. U.S. Department of Agriculture Economic Research Report, 2, pp. 1–11, 2005.

[50] Astee, L.Y. & Kishnani, N., Building integrated agriculture: Utilising rooftops for sustainable food crop cultivation in Singapore. Journal of Green Building, 5(2), pp. 105–113, 2010. https://doi.org/10.3992/jgb.5.2.105

[51] Sauerborn, J., Skyfarming: An alternative to horizontal croplands. Resource Magazine, 18, pp. 938–941, 2011.

[52] Ellingsen, E. & Despommier, D., The vertical farm: The origin of a 21st century architectural typology. CTBUH Journal, 3, pp. 26–34, 2008.

[53] Delor, M., Current State of Building-Integrated Agriculture, Its Energy Benefits and Comparisons with Green Roofs, University of Sheffield, Sheffield, UK, 2011.

[54] Reinhardt, W., Albright, L. & de Villiers, D.S., Energy investments and CO2 emissions for fresh produce imported into New York State compared to the same crops grown locally. New York State Energy Research and Development Authority, pp. 8–10, 2008.

[55] Specht, K., Siebert, R., Hartmann, I., Freisinger, U.B., Sawicka, M., Werner, A., Thomaier, S., Henckel, D., Walk, H. & Dierich, A., Urban agriculture of the future: An overview of sustainability aspects of food production in or on buildings. Agriculture and Human Values, 31(1), pp. 33–51, 2014. https://doi.org/10.1007/s10460-013-9448-4

[56] Bhanoo, S., Vertical farms will be big, but for whom? Indoor farming might help feed millions, or at least make millions, https://www.fastcompany.com/3039087/verticalfarms-will-be-big-but-for-who (accessed 7 May 2019).

[57] de Nijs, B., Does vertical farming make sense? Hortidaily.com, https://www.hortidaily. com/article/35974/Does-vertical-farming-make-sense/ (accessed 7 May 2019).

[58] Vogl, C.R., Axmann, P. & Vogl-LuKasser, B., Urban organic farming in Austria with the concept of Selbstemte (‘self-harvest’): An agronomic and socio-economic analysis. Renewable Agriculture and Food Systems, 19(2), pp. 67–79, 2004. https://doi. org/10.1079/rafs200062

[59] Ackerman, K., Dahlgren, E. & Xue, X., Sustainable Urban Agriculture: Confirming Viable Scenarios for Production, New York State Energy Research and Development Authority: Albany, New York, 2013.

[60] Taylor, J.R. & Lovell, S.T., Urban home food gardens in the Global North: research traditions and future directions. Agriculture and Human Values, 31(2), pp. 85–305, 2014. https://doi.org/10.1007/s10460-013-9475-1

[61] Swaney, D.P., Howarth, R.W. & Hong, B., Nitrogen use efficiency and crop production: Patterns of regional variation in the United States, 1987–2012, Science of the Total Environment, 635, pp. 498–511, 2018. https://doi.org/10.1016/j.scitotenv.2018.04.027

[62] Suh, S. & Yee, S., Phosphorus use-efficiency of agriculture and food system in the U.S. Chemosphere, 84(6), pp. 806–813, 2011. https://doi.org/10.1016/j.chemosphere.2011.01.051

[63] Hoornweg, D. & Bhada-Tata, P., What a Waste - A Global Review of Solid Waste Management, World Bank Urban Development Series Knowledge Papers, 15, 2012.

[64] Fletcher, T.D., Deletic, A., Mitchell, V.G. & Hatt, B.E., Reuse of urban runoff in Australia: A review of recent advances and remaining challenges. Journal of Environmental Quality, 37(5_Supplement), pp. S–116, 2008. https://doi.org/10.2134/jeq2007.0411

[65] Barthel, S., Parker, J. & Ernstson, H., Food and green space in cities: A resilience lens on gardens and urban environmental movements. Urban Studies, 52(7), pp. 1321–1338, 2015. https://doi.org/10.1177/0042098012472744

[66] Barthel, S., Folke, C. & Colding, J., Social-ecological memory in urban gardens-Retaining the capacity for management of ecosystem services. Global Environmental Change, 20(2), pp. 255–265, 2010. https://doi.org/10.1016/j.gloenvcha.2010.01.001

[67] Endres, A.B. & Endres, J.M., Homeland security planning: What victory gardens and Fidel Castro can teach us in preparing for food crises in the United States. Food and Drug Law Journal, 64, pp. 405–439, 2009.

[68] Warwick, H., Cuba’s organic revolution. Forum for Applied Research and Public Policy, 16, pp. 54–58, 2001.

[69] Brown, M.E., Antle, J.M., Backlund, P., Carr, E.R., Easterling, W.E., Walsh, M.K., Ammann, C., Attavanich, W., Barrett, C.B., Bellemare, M.F., Dancheck, V., Funk, C., Grace, K., Ingram, J.S.I., Jiang, H., Maletta, H., Mata, T., Murray, A., Ngugi, M., Ojima, D., O’Neill, B. & Tebaldi, C., Climate Change, Global Food Security, and the U.S. food system. U.S. Department of Agriculture, 2015.

[70] Ostrum, E., Polycentric systems for coping with collective action and global environmental change. Global Environmental Change, 20(4), pp. 550–557, 2010. https://doi. org/10.1016/j.gloenvcha.2010.07.004

[71] Qui, G., Li, H., Zhang, Q., Chen, W., Liang, X. & Li, X., Effects of evapotranspiration on mitigation of urban temperature by vegetation and urban agriculture. Journal of Integrative Agriculture, 12(8), pp. 1307–1315, 2013. https://doi.org/10.1016/s2095-3119(13)60543-2

[72] Egerer M.H., Lin, B.B., Threlfall, C.G. & Kendal, D., Temperature variability influences urban garden plant richness and gardener water use behavior, but not planting decisions. Science of the Total Environment, 646, pp. 111–120, 2019. https://doi.org/10.1016/j. scitotenv.2018.07.270

[73] Barthel, S. & Isendahl, C., Urban gardens, agriculture, and water management: Sources of resilience for long-term food security in cities. Ecological Economics, 86, pp. 224–234, 2013. https://doi.org/10.1016/j.ecolecon.2012.06.018

[74] Somerville, C. & Ferrand, C., Aquaponics in Gaza, Field Exchange 46: Special Focus on Urban Food Security & Nutrition, September 2013.

[75] Foskett, D., Food Security and Small-Scale Aquaponics: A Case Study on the Northern Mariana Island of Rota, M.A. Thesis, University of Oregon, 2014.

[76] Moore, A., This local agtech startup wants you to forget everything you know about farming. Upstate Business Journal, Online: https://upstatebusinessjournal.com/thislocal-agtech-startup-wants-you-to-forget-everything-you-know-about-farming/, 5 March 2018 (accessed 7 May 2019).

[77] Agricultural Marketing Research Center, Lettuce. Online: https://www.agmrc.org/commodities-products/vegetables/lettuce (accessed 7 May 2019).

[78] Pioneer Press, Census: Minneapolis-St. Paul metro adds more than 250,000 residents since 2010. Online https://www.twincities.com/2018/03/22/census-minneapolis-stpaul-metro-adds-more-than-250000-residents-since-2010/ (accessed 15 May 2019).

[79] University of California Cooperative Extension, Sample production costs for wrapped iceberg lettuce sprinkler irrigated–40-inch beds: Central Coast, 2010. Online: https:// coststudyfiles.ucdavis.edu//uploads/cs_public/a4/bb/a4bb20f0-4bfe-404e-b47eb7a634ca80b5/2010lettuce_wrap_cc.pdf (accessed 15 May 2019).

[80] Goldstein, B.P., Hauschild, M.Z., Fernandez, J. & Birkved, M., Testing the environmental performance of urban agriculture as a food supply in northern climates. Journal of Cleaner Production, 135, pp. 984–994, 2016. https://doi.org/10.1016/j. jclepro.2016.07.004

[81] Ronan, D., Cost of operating a truck up 6% to $1.69 per mile, ATRI report says, Transpor Topics, Online: https://www.ttnews.com/articles/cost-operating-truck-6-169-mile-atrireport-says (accessed 15 May 2019).

[82] City of Minneapolis Land Capacity Analysis, 2010. Online: http://www.minneapolismn.gov/www/groups/public/@cped/documents/webcontent/convert_261135.pdf, (accessed 15 May 2019).

[83] U.S. Climate Data. Online: https://www.usclimatedata.com/climate/minneapolis/minnesota/united-states/usmn0503, (accessed 15 May 2019).

[84] Minneapolis Water Treatment and Distribution Services. Online: http://www.minneapolismn.gov/publicworks/water/water_waterfacts (accessed 15 May 2019).

[85] Kubota, C., Controlled Environment Agriculture for Urban Food Production, 2018 Urban Food Systems Symposium, Minneapolis, MN, 2018.

[86] Barbosa, G.L., Gadelha, F.D.A., Kublick, N., Proctor, A., Reichelm, L., Weissinger, E., Wohlleb, G.M. & Halden, R.U., Comparison of land, water, and energy requirements of lettuce grown using hydroponics vs. conventional agricultural methods. International Journal of Environmental Research and Public Health, 12(6), pp. 6879–6891, 2015. https://doi.org/10.3390/ijerph120606879

[87] Xcel Energy, Carbon dioxide emission intensities, 2018. Online: https://www.xcelenergy.com/staticfiles/xe-responsive/Environment/Carbon/Xcel-Energy-Carbon-Dioxide-Emission-Intensities.pdf (accessed 15 May 2019). 194

[88] Riley, M., Pentair shutting down urban organics aquaponics facility in St. Paul. Minneapolis/St. Paul Business Journal, 15 May 2019, Online: https://www.bizjournals.com/twincities/news/2019/05/15/pentair-shutting-down-urban-organics-aquaponics.html (accessed 20 May 19).

[89] Odum, E. P., Ecology and Our Endangered Life-Support Systems, Sunderland, MA: Sinauer Associates, 1989.

[90] CoDrye, M., Fraser, E.D.G. & Landman, K., How does your garden grow? An empirical evaluation of the costs and potential of urban gardening. Urban Forestry & Urban Greening, 14(1), pp. 72–79, 2015. https://doi.org/10.1016/j.ufug.2014.11.001

[91] Haberman, D., Gillies, L., Canter, A., Rinner, V., Pancrazi, L. & Martellozzo, F., The potential of urban agriculture in Montreal: A quantitative assessment. ISPRS International Journal of GeoInformation, 3(3), pp. 1101–1117, 2014. https://doi.org/10.3390/ ijgi3031101

[92] Hara, Y., Murakami, A., Tsuchiya, K., Palijon, A.M. & Yokohari, M., A quantitative assessment of vegetable farming on vacant lots in an urban fringe area in Metro Manila: Can it sustain long-term vegetable demand? Applied Geography, 41, pp. 195–206, 2013. https://doi.org/10.1016/j.apgeog.2013.04.003

[93] MacRae, R., Gallant, E., Patel, S., Michalak, M., Bunch, M. & Schaffner, S., Could Toronto provide 10% of its fresh vegetable requirements from within its own boundaries? Matching consumption requirements with growing spaces, Journal of Agriculture, Food Systems, and Community Development, 1(2), pp. 105–127, 2010. https://doi. org/10.5304/jafscd.2010.012.008

[94] Orsini, F., Gasperi, D., Marchetti, L., Piovene, C., Draghetti, S., Ramazzotti, S., Bazzocchi, G. & Gianquinto, G., Exploring the production capacity of rooftop gardens (RTGs) in urban agriculture: the potential impact on food and nutrition security, biodiversity and other ecosystem services in the city of Bologna. Food Security, 6(6), pp. 781–792, 2014. https://doi.org/10.1007/s12571-014-0389-6

[95] Johnson, M.S., Lathuillière, M.J., Tooke, T.R. & Coops, N.C., Attenuation of urban agricultural production potential and crop water footprint due to shading from buildings and trees. Environmental Research Letters, 10(6), pp. 1–11, 2015. https:// doi.org/10.1088/1748-9326/10/6/064007

[96] Lee, G.G., Lee, H.W. & Lee, J.H., Greenhouse gas emission reduction effect in the transportation sector by urban agriculture in Seoul, Korea. Landscape and Urban Planning, 140, pp. 1–7, 2015. https://doi.org/10.1016/j.landurbplan.2015.03.012

[97] Hara, Y., McPhearson, Sampei, T. & McGrath, B., Assessing urban agriculture potential: A comparative study of Osaka, Japan and New York City, United States, Sustainability Science, 13(4), pp. 937–952, 2018. https://doi.org/10.1007/s11625- 018-0535-8

[98] Sioen, G.B., Sekiyama, M., Terada, T. & Yokohari, M., Post-disaster food and nutrition from urban agriculture: A self-sufficiency analysis of Nerima ward, Tokyo. International Journal of Environmental Research and Public Health, 14(7), p. 748, 2017. https://doi.org/10.3390/ijerph14070748

[99] Clark, K.H. & Nicholas, K.A., Introducing urban food forestry: A multifunctional approach to increase food security and provide ecosystem services. Landscape Ecology, 28(9), pp. 1649–1669, 2013. https://doi.org/10.1007/s10980-013-9903-z

[100] Colosanti, K. & Hamm, M.W., Assessing the local food supply capacity of Detroit, Michigan. Journal of Agriculture, Food Systems, and Community Development, 1(2), pp. 41–58, 2010. https://doi.org/10.5304/jafscd.2010.012.002