I found this great article on the Green Brooklyn blog about Sky Vegetables, a company that constructs and operates commercial, hydroponic greenhouses on the rooftops of supermarkets in the United States and eventually on all types of flat rooftops worldwide.
Think about it: every neighborhood supermarket could become a farmers market. The vegetables you buy today were growing a few feet away just yesterday.
Even cooler, they set up video cameras on the roof which send a live feed to a screen located in the produce section. Imagine buy a tomato that you've been watching grow for weeks!
