Seems to be a lot of activity with vertical farms (depending on LED lights, not the sun) and big greenhouses. The initial idea was to grow greens, which made sense because they're quick and easy to grow and reasonably valuable. With the legalization of marijuana the horizons have expanded in some states. Hydroponic tomatoes have been around for a while.
See this Reuters piece on vertical farms.
See this on an urban farm in Paris.
And this on an aquaponics/greenhouse farm in Maine.
And this NYTimes piece on a big greenhouse in Kentucky.
I'm not convinced that such farms will make a big contribution to the food supply over the next 10 or 20 years, but hope I'm around to see.
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