Applying the Food-Energy-Water Nexus approach to urban agriculture: from FEW to FEWP (Food-Energy-Water-People)

Many studies examine the correlation between the use of resources such as water, energy and land, and the production of food. These nexus studies focus predominantly on large scale systems, often considering the social dimensions only in terms of access to resources and participation in the decision-making process, rather than individual attitudes and behaviours with respect to resource use. Such a concept of the nexus is relevant to urban agriculture (UA), but it requires customisation to the particular characteristics of growing food in cities, which is practiced mainly at a small scale and produces not only food but also considerable social, economic, and environmental co-benefits. To this end, this paper proposes a new concept for a UA Nexus, together with a methodology for its assessment, that explicitly includes social dimensions in addition to food, energy and water. The paper develops a new conceptual basis, introducing People, together with Food, Energy and Water, as factors of the UA Nexus. A methodological approach for its assessment is presented, aimed at measuring not only resource efficiency and food production but also motivations and health benefits, as well as the ecological awareness of urban farmers. The methodology is based on a combination of methods such as diaries of everyday UA practices, a database of UA activities, life cycle assessment (LCA), and material flow analysis to connect investigations developed at a garden scale to the city scale.