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Pistachios, a possible energy source for a Turkish city.
November 20, 2014 Converting the shells into biogas could provide most of the heat for a planned city of 200,000, engineers say. There's precedent in Australia, where macadamia nut shells are generating power.
Arugula plant beds inside The Plant, a vertical farm operation in Chicago.
Plant Chicago, NFP/Rachel Swenie
April 9, 2014 As vertical farming takes root in cities around the world, critics fear it's leaving a big carbon footprint. An experiment in Chicago turning garbage into energy aims to prove them wrong.
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