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> you have made many assumptions
This one I understand, and I understand your concern. There's plenty of improvement we can add to the current farming practices. There's biochar, permaculture, hydroponics etc.
But there's one thing you can't do: you cannot move people from their lives back to farming from before the Green Revolution, when whole countries were largely agrarian, and people were working 16 h per day, 200 days per year just to feed themselves.