How do we get efficient food production in a post-oil (hydrocarbon) society using as little space as possible?

I asked a similar question a small while ago. Unfortunately, the way the problem was defined excluded certain viable solutions. So I want to try again.

It would have to use reliable alternative energy like nuclear fission and geothermal.

Top soil would be depleted and mining phosphorous or extracting it from human waste would not be viable on a large scale.

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How do we get efficient food production in a post-oil (hydrocarbon) society using as little space as possible?

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