This brilliant concept has just made my day! Bright Farms LLC designs, finances and operates rooftop hydroponic greenhouses at supermarket retailers. Hydro-what?? That was my first thought too :-) Their aim is to eliminate shipping costs by building greenhouses on the roofs of supermarkets, thereby producing the most “local” food imaginable. Find out more about their amazing projects here. And if you know of a supermarket roof suitable for this... get in touch!