Rooftop Fish Farms

The prototype Globe/Hedron is a bamboo greenhouse designed to utilize aquaponic farming techniques. Optimized to feed four families of four all year round, the unit could annually produce 220 lb. of fish and 880 lb. of vegetables.
The geodesic-dome design allows the fish tank's weight to be redistributed to a larger surface, so the unit can be placed on more roofs without any structural building adaptation. The dome can also be equipped with PV panels and cooling turbines to generate energy, and the basic structure can be adapted with greenhouse panels or insulating panels to suit different environments and weather conditions.
Once on the market, the unit could sell for about the price of a small car.
(Source: treehugger.com)