Grass makes better ethanol than corn

Farmers in Nebraska and the Dakotas brought the U.S. closer to becoming a biofuel economy, planting huge tracts of land for the first time with switchgrass—a native North American perennial grass (Panicum virgatum) that often grows on the borders of cropland naturally—and proving that it can deliver more than five times more energy than it takes to grow it...

Read the full article in Scientific American.  See also "Grass biofuels cut CO2 by 94 percent" from BBC news.