How Big a Deal Is Trump’s Fuel Economy Rollback? For the Climate, Maybe the Biggest Yet

But pollution from cars and trucks has proved much trickier for states to take on. Transportation now accounts for one-third of America’s carbon-dioxide emissions, surpassing power plants as the largest source, and vehicle emissions have been steadily rising over the past few years. Federal fuel-economy standards were widely seen as a vital tool for curbing gasoline use.

“We’ve seen nowhere near the same progress in transportation as we’ve seen in electricity,” said Jordan Stutt, a policy analyst at the Acadia Center, a group in New England that is pushing for cleaner energy.

Read the full article from the New York Times here.