Reuters: Alternative fuels made from corn, soybeans, sugar cane and palm trees can in some cases increase the amount of climate-warming carbon dioxide that goes into the atmosphere, U.S. researchers reported on Thursday. These so-called food-based biofuels can actually hurt the environment if they are produced on land that was formerly grassland, rain forest or savanna, the scientists said in the journal Science. Industry groups took issue with the findings, calling them simplistic and …