I remember I read something about vertical farms.
Instead of having 100 m2
of farmland spread over ... 100 m2
... of the planet, we could have four little 25 m2
patches, but stacked vertically. It's feasible, as long as you have a good water supply, good structure for the land, etc., etc.
edited 9th Dec '11 7:43:45 PM by Inhopelessguy