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BTW, these towers could be readily built with existing technology and the savings on fuel transporation and harvesting costs alone would be worth the difference. That and being able to grow crops continually year round far outweigh any initial expenses.
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I doubt both of these statements. It is cheaper right now to import tomatoes from the southern hemisphere than growing them in greenhouses locally. Transportation is really really cheap over very long distances, and heating is really expensive.
And greenhouses cost a lot less than towers.