U.S. Environmental Protection Agency (EPA) and the U.S. Department of Transportation’s National Highway Traffic Safety Administration (NHTSA) jointly finalized standards for medium- and heavy-duty vehicles that will improve fuel efficiency and cut carbon pollution, while bolstering energy security and spurring manufacturing innovation. The final phase two standards were called for by President Obama’s Climate Action Plan, and respond to the President’s directive in early 2014 to develop new standards that run into the next decade.