California has made good on its promise to sue the U.S. EPA over the agency’s refusal to allow the state to regulate greenhouse-gas emissions from vehicles, and 15 other states have made good on their promise to join in on the litigation. The swarm of states, along with five nonprofit groups, filed suit today in the Ninth Circuit Court of Appeals in San Francisco. The presumed shared feeling of the group, as stated by California Attorney General Jerry Brown: “The denial letter was shocking in its incoherence and utter failure to provide legal justification for the administrator’s unprecedented action.”