How Do You Feed a City?

"How do you feed a city?" asks Carolyn Steel, an architect. "It is one of the great questions of our time, yet it is one that is rarely asked. We take it for granted that if we go into a shop or a restaurant... there is going to be food there waiting for us, having magically come from somewhere. But when you think this, every day for a city the size of London" -- or even Baltimore -- "enough food has to be produced, transported, bought and sold, cooked, eaten, and disposed of, and that something similar has to happen every day for every city on earth, it's remarkable that cities get fed at all...."