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What is a process of a population's shifting from farms to cities?

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How is farming an auto-catalytic process?

  Acording to the book 'Guns, Germs, and Steel' by Jared Diamond; Farming is considered an auto-catalytic process because it creates a positive FEEDback cycle (no pun in

Is it easy to shift from chemical farming to organic farming?

No. It takes several years in which you have to practice organic farming (which costs more) and sell your produce as regular crops with regular prices. It also means learning