Transcript for scene 32 of the video " Floods and Ice Age - Part 2" by Rolf Witzsche  

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Hydroponics is already commercially utilized

Hydroponics is already commercially utilized to grow food right in the cities, in old warehouses, with artificial lighting tuned to the plans' needs, and with climate control.

The process requires no soil and uses 95% less water. Nor does it require pesticides, but requires substantial energy for lighting, possibly in the order of 20 watts per square meter.

https://www.youtube.com/watch?v=-_tvJtUHnmU

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche