A man harvests fruits of the Jatropha tree in Taabo, Ivory Coast. Jatropha, which is grown in many parts of the world, has fallen from favor as a diesel fuel substitute.
Kambou Sia/AFP/Getty Images
August 21, 2012 People thought the hardy Jatropha tree was the answer to the food vs. fuel debate, until it wasn't. Financial hard times and a misunderstanding revealed this biofuel to be like all the rest — in need of good food and water.
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A worker with cooking oil in a holding barrel behind an Ashton, Maryland restaurant.
TIM SLOAN/AFP/Getty Images
November 7, 2011 Grease rustling is on the rise, as thieves make off with used restaurant grease. The goo left over from deep-fat frying is prized on the biofuels market. As fuel prices go up, so does the price of recycled grease.
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