The new plan would require automakers to comply with the state's more stringent greenhouse gas emissions rules despite proposed rollbacks.
The plan would end efforts to make cars and trucks average more than 50 miles per gallon by 2025.
This move will bring up questions about the waiver that currently allows California to set its own, stricter emissions standards.
Rules intended to protect people from pollution are simultaneously saving the lives of whales by slowing down cargo ships, but researchers say more still needs to be done.
The effect of lax federal fuel standards on the climate fight depends largely on the fate of the California waiver.
U.S. regulators are now dinging Volkswagen for cheating on nitrogen oxides emissions tests. Data shows that officials are right to be upset.
Fuel economy is a great idea, unless you’re counting on the taxes that fuel sales generate to pay for something. Maybe there’s a better way …
A national gathering of transportation wonks try to square the circle, fitting private cars into a low-carbon economy.