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While announcing new fuel efficiency standards for cars and light trucks on Tuesday, President Barack Obama said “unchecked” carbon pollution prior to his administration’s efforts to raise fuel economy standards “was having severe impacts on our weather.”

“Carbon pollution was going unchecked, which was having severe impacts on our weather,” Obama said in a speech at a Safeway distribution center in Upper Marlboro, MD.

For decades, fuel efficiency standards had been “stuck in neutral, even as other kinds of technology leapt forward,” the president said. The economy was “vulnerable to fluctuations in oil prices.”