Darkened by soot from vehicles and factories, the region’s glaciers are absorbing more heat and melting at dangerous rates.

© Jason Gulley for The New York Times

The Trump administration wants to roll back some Biden-era restrictions on smog-causing emissions from heavy-duty vehicles.

© Justin Sullivan/Getty Images

It has stopped criminal prosecutions of people who install “defeat devices,” which make diesel trucks faster and more efficient but also dirtier.

© Acacia Johnson for The New York Times

It has stopped criminal prosecutions of people who install “defeat devices,” which make diesel trucks faster and more efficient but also dirtier.

A lawsuit filed in California claims the automaker’s philanthropic arm stole technology intended to help poor farmers, but it is not clear to what end.

California truckers have expressed strong interest in the Tesla Semi because it costs much less and can travel further on a charge than electric trucks sold by established manufacturers.