FALKENHAGEN, GERMANY - MAY 06:  A sign on a gasoline pump shows biodiesel prices at a Biofuel station on May 6, 2008 in Falkenhagen, Germany. Biodiesel will be added to regular diesel in order to reduce CO2 emissions. Germany has committed itself to raising the content of biodiesel in commercially-sold diesel from 5% to 7% starting in 2009. The use of rapeseed for biodiesel production has come under criticism in recent months, as experts charge that the practice reduces the amount of agricultural land available for food production and hence adds to the dramatic rise in world food prices. Getty Images logo Getty Images 18 months ago

FALKENHAGEN, GERMANY - MAY 06: A sign on a gasoline pump shows biodiesel prices at a Biofuel station on May 6, 2008 in Falkenhagen, Germany. Biodiesel will be added to regular diesel in order to reduce CO2 emissions. Germany has committed itself to raising the content of biodiesel in commercially-sold diesel from 5% to 7% starting in 2009. The use of rapeseed for biodiesel production has come under criticism in recent months, as experts charge that the practice reduces the amount of agricultural land available for food production and hence adds to the dramatic rise in world food prices.