Hours after being sworn in as the new U.S. Secretary of Transportation, Sean Duffy took aim at the main way the federal government regulates miles per gallon for cars and pickup trucks — also a principal way that it controls air pollution and addresses climate change.

President Donald Trump has signed an executive order promising to eliminate what he incorrectly labels “the electric vehicle mandate” imposed under former President Joe Biden.

The U.S. government’s most ambitious plan ever to slash planet-warming greenhouse gas emissions from passenger vehicles faces skepticism about how realistic it is and whether it goes far enough.

DETROIT – General Motors says it will no longer support the Trump administration in legal efforts to end California's right to set its own clean-air standards. Toyota, one of the big automakers in the coalition favoring the Trump standards, said Monday it is reconsidering its position. In September of 2019, Trump announced his administration would seek to revoke California’s congressionally granted authority to set standards that are stricter than those issued by federal regulators. The move came after Ford, BMW, Honda and Volkswagen signed a deal with the California Air Resources Board, which had been at odds with the Trump administration for months. The Trump administration’s plan increased fuel economy by 1.5% per year, backing off an earlier proposal to freeze the requirements at 2021 levels.