Suzanne Paulson in Arizona PBS: ‘Many lives at risk’: What pollution rollbacks could mean for California and Arizona

Experts say there are simpler ways to help fix climate change, particularly using less energy from fossil fuels. Suzanne Paulson, director at UCLA’s Center for Clean Air, said although much has been done, the waiver was a safety net for California skies.

“There are always further steps that can be taken to clean up the air more. Historically, one of the dominant sources was cars and trucks on the roadways,” Paulson said. “Partly through the waiver, we have set California-specific emissions controls that have served to clean up the air tremendously.”