Democratic presidential candidate U.S. Senator Barack Obama (D-IL) speaks about the use of alternative fuels at the Biodiesel Fueling Facility at the University of New Hampshire in Durham, New Hampshire, April 20, 2007. REUTERS/Brian Snyder (UNITED STATES)
Democratic presidential candidate U.S. Senator Barack Obama (D-IL) reveals his plan to reduce noxious greenhouse gas emissions in Durham, New Hampshire, April 20, 2007. REUTERS/Brian Snyder (UNITED STATES)