The Trump administration announced a rollback of fuel efficiency standards last week for how much gas cars and trucks use.

Instead of the Obama-era goal of nearly 55 miles per gallon by 2025, the Trump administration will bring that down to 40 miles per gallon. 

It was a big blow for Colorado, where transportation is the largest contributor of greenhouse gases in the state. 

“It just doesn’t make sense from a cost perspective, from a health perspective, from an environmental perspective. It’s the wrong way to go,” said Danny Katz, state director of the Colorado Public Interest Research Group. “And it just costs more at the pump. You just literally have to pay more for every mile that you’re driving.”