This undated combo photo, provided by the University of Nebraska-Lincoln, shows corn residue after grain harvest, left, adjacent to a field section where corn residue was baled and removed after grain harvest in Jefferson County, Neb. Biofuels made from corn leftovers after harvest are worse than gasoline for global warming in the short term, challenging the Obama administration's conclusions that they are a cleaner oil alternative from the start and will help climate change. (AP Photo/The University of Nebraska-Lincoln)
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