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For every 10 ears of corn that are grown in the United States today, only 2 are consumed directly by humans as food. The remaining 8 are used in almost equal shares for animal feed and for ethanol .

Growing cellulosic feedstocks on federally subsidized conservation land could balance the biofuels emissions equation to be completely carbon-neutral, a study suggests.

Though automakers are scrambling to roll out hybrid and electric vehicles as fast as they can, BP believes that biofuels are the only way forward--at least for the time being. Olivier Mace, head of strategy, regulatory affairs and communications at BP Biofuels, explained at a London conference yesterday that demand in China and India, two of the fastest-growing markets, would make biofuels at least 12% of the worldwide road transport fuel mix by 2030