This is an entertaining and educational article. As population grows we'll certainly need more food and have to expand our capacity to produce. The planet just can't handle it. I'm a science fiction writer and like to think of radical ways to solve (and create) problems many years in the future. As far as agriculture is concerned, I think we'll need to take our farms to outer space. This will ease agricultural pressures on the planet. We can place an endless number of farms around earth's orbit and grow all of our produce in space. Those ancient techniques that you mentioned could come in handy in this process. Imagine that! We save the planet by growing our potatoes in outer space. Think local; buy orbital.
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