http://www.scientificamerican.... corn-based ethanol corn-based ethanol cellulosic biofuels switchgrass http://www.scientificamerican.... 9. Grass Makes Better Ethanol Than Corn Does 9. Grass Makes Better Ethanol Than Corn Does http://www.scientificamerican.... cellulosic biofuels corn-based ethanol http://www.scientificamerican.... cellulosic biofuels http://www.scientificamerican.... switchgrass http://www.scientificamerican....