But there are some new ideas that may seem a bit strange. How about gathering your homegrown vegetables from your roof? Instead of growing fruits and vegetables in rolling field, miles away from cities, grow them in the city-on rooftops, in backyards, on vacant lots. A school in New York City has constructed a small farm on part of its playground, and the produce is sold during the summer at local farm stands. Across the world, small urban farms are "sprouting" up to help make the cities green and to feed urban dwellers.