Biodiesel Everywhere

Speaker of the House Nancy Pelosi, D-Calif., holds a bottle of biodiesel fuel in Seattle in April 2007. (AP)

Country-music legend Willie Nelson holds up the pump before filling his bus with Bio Willie Diesel Fuel at the Pearson Ford alternative fuel station in San Diego in February 2006. (AP)

A bottle of biodiesel in a 2001 file photo. (AP)

Two biodiesel-powered buses at the Idaho National Laboratory near Idaho Falls, Idaho. (Idaho National Laboratory/Department of Energy)

A tank of B20-blend biodiesel used to fuel vehicles owned by the city of Flagstaff, Ariz. (City of Flagstaff)

Soybeans, often used in producing biodiesel. (Warren Gretz/Department of Energy)

A bus that runs on soybean-sourced biodiesel. (Nebraska Soybean Board)