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Because of technological limits, there is a certain amount of food that we can produce per acre. If we were to have intensive greenhouse agriculture, we could have much higher production.

"Nanotechnology: Designs for the Future". Interview with John Gehl, ubiquity.acm.org. July 2000.
Because of technological limits, there is a certain amount of food that we can produce per acre. If we were to have intensive greenhouse agriculture, we could have much higher production.