Enlarge / Polluted street scenes like this will remain common in the United States, which will abandon ambitious fuel efficiency standards in the face of complaints from automakers and unions. (credit: Getty Images)

It appears as if ambitious new fuel efficiency regulations that would require Americans to adopt many more electric vehicles are to be watered down. Last year, President Biden's administration published proposed new Corporate Average Fuel Economy regulations for 2027–2030, regulations that would require automakers to sell four times as many zero-emissions vehicles as they do now.

But opposition to the new CAFE standards has been fierce, and now Reuters reports that the White House is backing down and will issue new guidelines with less ambitious goals in the coming weeks.

The White House's goal had been for US EV adoption to reach 50 percent of all new light vehicle sales by 2030, rising to 60 percent by 2032. In part, it proposed changing the modifier applied to each new zero-emissions vehicle when used to calculate an automaker's fleet emissions.