To the Editor:

Re “Trump to Begin Undoing Vehicle Pollution Restrictions” (news article, March 4):

The Trump administration appears poised to take a wrecking ball to a rule that increases the mileage for cars, trucks and S.U.V.s, saves consumers money (on average $1,500 a vehicle), cuts oil use and reduces harmful pollution.

The automakers were key architects of these standards when they came out in 2012, but now some are trying to back out of their commitment, even though they are experiencing record sales, and new technologies are coming on line to make it faster and cheaper than expected to meet these standards.

It is a travesty that the Trump administration would let the car companies renege on such an important agreement. But it will be a long hard fight. It will take years to repeal the rule, and at the end of the day, the Trump administration will have to persuade a skeptical court that there is new information that justifies changing course.

Supporters of this rule are ready for that fight.

KEN KIMMELL, CAMBRIDGE, MASS.

The writer is president of the Union of Concerned Scientists.