Wisconsin is among two dozen states going to court in support of allowing the state of California to establish the mandatory fuel mileage requirements of cars across the country.
Wisconsin Attorney General Josh Kaul officially joined the lawsuit last week.
"[This] filing is part of the multi-state effort to protect the ability of states to keep leading the fight against climate change,” Kaul said. “It’s always important that states have the opportunity to lead efforts to protect our natural resources, and it’s especially important now, as the Trump administration has abandoned efforts to protect our environment.”
President Donald Trump frames it a bit differently. The president said back in September that he is revoking a years-old waiver that allowed California to set emissions standards as part of an effort to "produce far less expensive cars for the consumer, while at the same time making the cars substantially SAFER," the president Tweeted.
Kaul said Wisconsin has benefited from California's dominance when it comes to fuel emissions.
The drive to make cars more fuel efficient has led to electric engines, and smaller cars that get much better gas mileage than years ago. But critics say it's also led to smaller, lighter and less safe cars on the road.
Kaul's effort to join the California lawsuit puts the state in the battle over when, where and for what cause states can set their own policies.
Kaul says the fight over fuel emission standards is about more than California.
"When accounting for emissions savings from other states that have adopted California’s standards, these emission reductions nearly triple, and benefit the nation as a whole," Kaul wrote in a statement.
Wisconsin is joining California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maine, Massachusetts, Maryland, Michigan, Minnesota, Nevada, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia, and Washington in the lawsuit. Washington, Los Angeles, San Francisco, and New York City are also chiming-in.