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FILE - This Jan. 9, 2009, file photo shows equipment inside a pilot plant in Scotland, S.D., that turns corn cob into cellulosic ethanol, a precursor to a commercial-scale biorefinery planned for Emmetsburg, Iowa. 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/Dirk Lammers, File)
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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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In this April 15, 2014 photo, school officials Jeff Woodbury, left, and Dan O’Shea overlook an automated system that delivers wood chips to a new wood furnace that heats the middle and high schools in Falmouth, Maine. The furnace was partially funded from a grant of federal stimulus dollars to the Maine Forest Service. The grant program helped 24 facilities slash costs for the heating season ending in 2013 by replacing nearly 900,000 gallons of heating oil with locally produced wood chips and pellets. (AP Photo/Blake Davis)
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In this April 15, 2014 photo, Jeff Woodbury, assistant school facilities director checks, on a wood heat furnace used by schools in Falmouth, Maine. The furnace was partially funded from a grant of federal stimulus dollars to the Maine Forest Service. The grant program helped 24 facilities slash costs for the heating season ending in 2013 by replacing nearly 900,000 gallons of heating oil with locally produced wood chips and pellets. (AP Photo/Blake Davis)
