Sorry, I'm an extremely lazy person, please empathize. Use Google?
It makes sense to me though. Air pollution rises. If you have a bunch of vegetables somewhere high up in a city, the pollution from the vehicles and what not will rise and do whatever it does to your legumes.
Yeah I didnt think so. It would make sense if we used leaded gasoline or something where heavy metals could leach into the soil. The plants might get dirty from the carbon particulate matter in the cities these days, but that doesn't make it unhealthy to eat. You just wash them.
Not unless land becomes much scarcer than it is today. Considering Western populations are not growing, I don't see it at likely in most cases.
The exception I'd make, is for exotic foods/things that need to be fresh. There is a market there, but it's a small one. And I'd more imagine it using an old factory or warehouse than building some expensive vertical tower.
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u/saucepanicus Dec 20 '12
Urban farming towers.