Sometimes you have to fight to preserve progress:
The lawsuit argues that the final Safer Affordable Fuel-Efficient Vehicles (SAFE) rule stops progress that has been made to protect the environment and reduce greenhouse gas emissions, hurts the economy, and harms public health.
“The Trump administration’s new rule undoes hard-earned progress to protect our health, environment, and economy,” said Attorney General Josh Stein. “As Attorney General, I will fight to uphold the law and safeguard the air we breathe and the water we drink.”
"Hard-earned progress" is right on the money. The U.S. Supreme Court had to (literally) order George W. Bush's EPA to regulate vehicle emissions in 2007, and they fiddled around until Obama's EPA started genuinely working on it. But here's the kicker: auto makers responded to both the emissions regulations and CAFE Standards (MPG), and vast improvements were made in both areas. Traffic still backs up around LA, but most of the smog is gone. In other words, everybody's happy, except the anti-government ideologues. This is what we're dealing with:
In 2018, the Trump administration began dismantling the national Clean Car Standards by alleging they were no longer appropriate or feasible, despite the fact that the auto industry was on track to meet or exceed the standards. Attorney General Stein urged the administration to withdraw these plans. On March 31, 2020, the Trump administration announced its final rule rolling back the Clean Car Standards. The rule takes aim at the corporate average fuel efficiency standards, requiring automakers to make only minimal improvements to fuel economy—on the order of 1.5 percent annually instead of the previously anticipated annual increase of approximately 5 percent. The rule also guts the requirements to reduce vehicles’ greenhouse gas emissions, allowing hundreds of millions of metric tons of avoidable carbon emissions into our atmosphere over the next decade.
The filing argues that the final rule unlawfully violates the Clean Air Act, the Energy Policy and Conservation Act, and the Administrative Procedure Act because the EPA and the NHTSA violated statutory text and congressional mandates and improperly and unlawfully relied on an analysis riddled with errors, omissions, and unfounded assumptions in an attempt to justify their desired result.
It's a shame the United States Senate is so compromised by Donald Trump that states themselves have to enforce Federal statutes, but here we are.