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Under quarantine, people have rushed to build their own backyard gardens.

Without a significant infusion of capital, vertical farms won't be cropping up in every city anytime soon. They're expensive both to get up and running and to operate, with high energy costs in order to power thousands of LED lights and sophisticated ventilation systems.

Produce is then shipped to local stores, usually within a 200-mile radius of the farm.

The produce is harvested with fewer workers than a typical farm needs, and the growing season never ends.

While the majority of people now live in cities, very little of our food is produced there.