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President Barack Obama arrives to speak about how having a fuel-efficient truck fleet will boost the economy and help combat climate change, Tuesday, Feb. 18, 2014, at the Safeway Distribution Center in Upper Marlboro, Md. (AP Photo/Jacquelyn Martin)
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President Barack Obama speaks about how having a fuel-efficient truck fleet can boost the economy and help combat climate change, Tuesday, Feb. 18, 2014, at the Safeway Distribution Center in Upper Marlboro, Md. (AP Photo/Jacquelyn Martin)
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President Barack Obama speaks about how having a fuel-efficient truck fleet can boost the economy and help combat climate change, Tuesday, Feb. 18, 2014, at the Safeway Distribution Center in Upper Marlboro, Md. (AP Photo/Jacquelyn Martin)
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In this Feb. 6, 2014 photo, Chase Iron Eyes, an attorney and American Indian activist on the Standing Rock Reservation, is seen in Fort Yates, N.D., talking about being less dependent on propane and finding alternative ways to heat houses on the reservation. As many as 5,000 homes on the reservation that straddles the North Dakota-South Dakota border rely on propane for heat. Iron Eyes is spearheading a pilot program that would outfit reservation homes with heat stoves that burn pellets made from natural materials. (AP Photo/Kevin Cederstrom)
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With a map of the United States on a truck in the background, President Barack Obama speaks about how having a fuel-efficient truck fleet can boost the economy and help combat climate change, Tuesday, Feb. 18, 2014, at the Safeway Distribution Center in Upper Marlboro, Md. (AP Photo/Jacquelyn Martin)
