Urban farming has been developed alongside the growth of its cities. it was so efficient in fact, that many of china’s largest cities almost exclusively sustained themselves with local produce- most was sold within 10km of the farm, and within a day of its cultivation, explains the wwf. in shanghai particularly, the government refined a very effective system for not only food production but waste management as well, recycling biomass into usable clean energy. in the late 20th century, shanghai produced ‘nearly 100% of chicken, eggs and milk, 80% of vegetables and freshwater fishes, and 50% of pork’ in a 300,000 hectare city-managed green ring integrated into the city- a cyclical and veritable urban farm.