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biofuels biomass broin cellulose cellulosic ethanol conservation cop15 biofuels ethanol copenhagen ghg energy corn corn cobs crop residue emmetsburg energy epa ethanol green harvest iowa poet sustainability usda water
biofuels biomass broin cellulose cellulosic ethanol conservation cop15 biofuels ethanol copenhagen ghg energy corn corn cobs crop residue emmetsburg energy epa ethanol green harvest iowa poet sustainability usda water …less