Another fantastic idea out of the TEDx Manhattan talks in January - Indoor, edible walls. Steve Ritz, a grade school science teacher from the South Bronx grew enough food on the walls of his classroom to feed nearly 450 people. Ritz's effort is part of a larger effort to increase access to healthy, fresh food in cities, and to provide something of an oasis in so-called "food deserts."
There are, of course, limitations of these indoor walls - they will not be able to provide a comprehensive solution to vegetable shortages (hard to grow corn and rice in a vertical environment). But these walls prove that cities can provide food to their residents - urban spaces are not helpless in this regard. Possibly they are the beginning of a larger shift whereby vertical food production will no longer be a futuristic, urban dream, but a practical and viable alternative to importing food from around the world.
Painting Over a Food Desert from The Washington Post