Faced with the acceleration of urbanization, climate change, and the limits of our current food system and determined to bring about a reinvention of food policies, urban agriculture is emerging as one driver for this new-look approach. Although urban agriculture cannot feed whole cities – potential yields are too low and restricted to certain types of food – it does make it possible to rekindle bonds between the urban and natural worlds, between cities and their foodstuffs, as well as helping to meet local demand. It is a very successful form of agriculture that is cropping up more and more in emerging and developed economies alike. The movement involves a growing number of actors: municipalities, supermarket, and agro-alimentary companies, architects and engineers as well as civil society organizations that seek to develop this form of agriculture, usually driven by a desire to strengthen localties and change people’s buying and consuming habits. But it is a movement that takes many forms and it is important to distinguish between them, identifying the varied aims of its promoters: food self-sufficiency and productivity in highly built-up environments, short circuits, and limited environmental impacts, or simply rekindled social ties. With this issue of this Report.