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 is switching sides in the legal fight against California's right to set its own clean-air standards, abandoning the Trump administration as the president's term nears its close. CEO Mary Barra said in a letter Monday to environmental groups that GM will no longer support the Trump administration in its defense against a lawsuit over its efforts against California's standards. Already at least one other large automaker, Toyota, said it may join GM in switching to California's team. About a dozen other states follow California's standards. 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.