Trump Administration Unveils Its Plan to Relax Car Pollution Rules

The Trump administration on Thursday put forth its long-awaited proposal to freeze antipollution and fuel-efficiency standards for cars, significantly weakening one of President Barack Obama’s signature policies to combat global warming. The proposed new rules would also challenge the right of states, California in particular, to set their own, more stringent tailpipe pollution standards. That would set the stage for a legal clash that could ultimately split the nation’s auto market in two.