The Environmental Protection Agency did not say how far the Obama-era rules should be rolled back, only that it would seek “more appropriate” standards. Want the latest climate news in your inbox? You can sign up here to receive Climate Fwd: , our new email newsletter. The Trump administration on Monday launched an effort to weaken Obama-era fuel economy standards for automobiles — and demanded that California, which has vowed to enforce stricter standards, fall in line — setting up a clash over one of the single biggest steps any government has taken to rein in emissions of earth-warming gases. Laid down in 2012, the fuel economy standards would have required automakers to nearly double the average fuel economy of new cars and trucks to 54.5 miles per gallon by 2025. If fully implemented, the rules would have cut oil consumption by about 12 billion barrels over the lifetime […]