monitored. It was claimed that the TerraFarm system "has achieved cost parity with traditional, outdoor farming" with each unit producing the equivalent of "3 to 5 acre of farmland", using 97% less water through water recapture and harvesting the evaporated water through the air conditioning.

In abandoned mine shafts

Vertical farming in abandoned mine shafts is termed "deep farming", and is proposed to take advantage of consistent underground temperatures and locations near or in urban areas. It would also be able to use nearby

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