Biofuels not as clean as it may seem

The New York Times ran an article yesterday on pollutants from the production of biofuel, the latest in a reminder that corn and soybeans may not be the answer to our fuel consumption. I've also read that because of increasing demand for corn-based ethanol, the price of corn (and thus, tortillas) - staples of the Mexican diet - have increased drastically, making it harder for ordinary people to afford their traditional groceries.