Learn about biofuels, which are attracting the attention of farmers, environmentalists, and some of the big energy giants. When the diesel engine was invented in the late 1800s, it was designed to run on vegetable oil. Country music legend Willie Nelson launched his own brand of biodiesel called "BioWillie," a blend of vegetable oil and regular diesel, so any vehicle with a diesel engine can run on it. BioWillie burns cleaner than regular diesel, creating less of the emissions that cause global warming. The fuel could also save family farms by giving farmers a new market for their crops.