California and a coalition of 16 other states and the District of Columbia sued the Trump administration over its plan to roll back greenhouse gas emissions standards for cars, trucks and S.U.V.s.
The move comes days after reports that the Environmental Protection Agency and Transportation Department plan to dramatically weaken federal auto emissions rules. California, which holds a waiver under the Clean Air Act that allows it to set its own standards for vehicle exhaust pollution, has pledged to stick with stricter Obama-era targets.
The problem for California is that they need to lower vehicle emissions if it wants to achieve its ambitious climate change goals. The Trump Administration are making that effort at the state level twice as hard.
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