Under Trump, California’s clean car rules are essential — and vulnerable

The Trump administration came close to fully dismantling the federal government’s regulation of greenhouse gas emissions from cars Monday, announcing a final plan to ease fuel-efficiency requirements . The move was largely symbolic: Congress had already eliminated the penalties automakers face for violating those standards. Those steps, along with a range of other reductions in federal climate authority, have now left the federal government with virtually no meaningful policy governing carbon pollution from cars, which…