Most ethanol comes from a few crops, including corn and sugar cane, but there are other promising sources that aren’t food crops.
Today the major crops used for biofuels are usually food crops, including corn, used for ethanol, and soy, for biodiesel — but alternatives are being developed.
2011 GMC Sierra flex-fuel badge.
Switchgrass could be an efficient new source of ethanol.
Algae is a promising option for producing biodiesel.