Could Manhattan Feed Manhattan?

This (silent) video by MVRDV explores what it would take to feed the people of Manhattan with the land on Manhattan. The upshot: We'd need a 23-mile high vertical farm. Or truly pervasive urban agriculture.[youtube]http://www.youtube.com/watch?v=4sDQufkrfm4Dietary changes would also reduce a city's foodprint, of course.Via Worldchanging.