It didn't take long for the debate on biofuels to heat up again, despite the bottom-of-the-barrel price of oil and an economy in the drink. This time, it was a study published in the February issue of Science that said corn-based ethanol could add nearly twice as many greenhouse emissions as fossil fuels. Not to be left out, the California State Regulators, among others, have jumped into the fray and now seem ready to declare that biofuel will not help reduce global warming.