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One inherent inefficiency about mega farms is that most of the soy (not sure how much of the corn, but a lot) goes to feed animals. Eventually, we "harvest" 10% of the input energy as calories. So these systems will never be more than 10% efficient in terms of human sustenance, no matter what technology is thrown at them.

Soy use in Brazil: https://globalforestatlas.yale.edu/amazon/land-use/soy

Trophic levels: https://en.wikipedia.org/wiki/Trophic_level#Biomass_transfer...