Obama sides with California

When President Barack Obama took office, the EPA reversed its denial and gave California a waiver to set limits on greenhouse gases in exhaust from new vehicles.  

The Obama administration also joined forces with the state to develop nationwide standards that tracked closely with California’s rules. The EPA set limits on greenhouse gas emissions, and the National Highway Traffic Safety Administration set fuel economy targets for new cars and light trucks — first through model year 2016, then through model year 2025.

Thirteen automakers and the United Auto Workers union signed on to the current rules. And in January 2017, right before Obama left office, the EPA concluded that automakers were well on their way to meeting the goals for model years 2022 to 2025.