Biofuels are an anti-science flam-flam on the gullible, usually done by the left (though some farmers who like subsidies are fans too). The idea is to take land that you could be using to feed people (either directly or feeding animals we eat), and convert it and valuable water resources into growing fuel instead. You turn calories in petroleum alternatives, like alcohol or vegetable oil, into car or power-plant food. This works, but it is not efficient, often more polluting than fossil fuels. And why use it if you have perfectly good and cheap toxic waste in the ground? You can pump it out, refine it, and burn it instead for a fraction the cost (which is why you need to subsidize it to make it viable). Just leave the food for people. Since it costs lots of money, and requires regulation and subsidies to work, the left has always been a fan.