OAKLAND, CA – FEBRUARY 18: Trucks line up to make deliveries at the Port of Oakland on February 18, 2014 in Oakland, California. U.S. President Barack Obama announced that his administration is beginning to develop a new phase of tighter fuel efficiency standards for medium and heavy-duty vehicles and has ordered the Environmental Protection Agency and Transportation Department’s National Highway Traffic Safety Administration to create and impose new fuel-efficiency and greenhouse gas standards by March 31, 2016. (Photo by Justin Sullivan/Getty Images)

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