The video creator does not assume hydroponics with grow lights, but open-air traditional growing techniques. Only in the case of extremely dense cities with little room, is aquaponics or chinampas considered.
But the amount of land it takes to efficiently grow crops is many, many times what the cities have available
David R. Montegomery’s book, Dirt referenced some interesting studies which seemed to indicate that urban farming can potentially out-produce industrial agriculture by 10 to 100 times, depending on the size (the smaller the farm, the more potential productive capacity).
Screenshot of the book referenced in another video (unfortunately also youtube):
That second video also referenced this interesting experiment by someone trying to sustain themselves off a small garden with limited time and effort put into it:
The video creator does not assume hydroponics with grow lights, but open-air traditional growing techniques. Only in the case of extremely dense cities with little room, is aquaponics or chinampas considered.
David R. Montegomery’s book, Dirt referenced some interesting studies which seemed to indicate that urban farming can potentially out-produce industrial agriculture by 10 to 100 times, depending on the size (the smaller the farm, the more potential productive capacity).
Screenshot of the book referenced in another video (unfortunately also youtube):
That second video also referenced this interesting experiment by someone trying to sustain themselves off a small garden with limited time and effort put into it:
https://www.unsustainablemagazine.com/home-gardens-vs-farms-efficiency/