Photos: Betting big on biodiesel

Betting big on biodiesel Start-up GreenFuel uses 3-meter-high tubes to mix algae with sunlight, water and carbon-carrying emissions from power plants to create biodiesel fuel. Credit: GreenFuel Related stories: Betting big on biodiesel The algae system is being put to the test with the help of MIT and an energy utility in the southwestern United States. Credit: GreenFuel Related stories: Betting big on biodiesel GreenFuel isn't alone in its work on biodiesel. Others include the Virginia Biodiesel Refinery, which President Bush visited on May 16. Credit: White House photo by Eric Draper Related stories: Betting big on biodiesel While GreenFuel's biodiesel is intended for use in power plants, other companies are producing plant-based fuel for cars, as at this filling station in Toronto. Credit: Zuma Press Related stories: Betting big on biodiesel Bloomington, Ind., uses the biodiesel fuel B20 in some vehicles in its public transportation fleet. Credit: National Biodiesel Board Related stories: