Food Scraps To Fuel Vertical Farming's Rise In Chicago

From plant factories fueled by the magenta glow of blue and red LED lights, to the 30-foot tall Ferris wheel for plants in Singapore, we've shown you the design possibilities for growing vegetables up instead of out.

But critics ask, what kind of stresses does that put on the plant? And how do you feed this kind of intensive cultivation without spending more than what you get back in the harvest?

They say one of the signs of reaching maturity is your ability to answer your critics. Well, vertical farming may be about at that stage.

Our colleagues over at Harvest Public Media report that in Chicago, entrepreneur John Edel is "working hard to show skeptics that garbage itself can fuel vertical farming." With a grant from the state of Illinois, Edel is "installing a giant anaerobic digester that will convert truckloads of food waste into biogas, burned onsite to keep the lights on," HPM reports.