The U.S. Justice Department filed lawsuits against four states this week, claiming their climate actions conflict with federal authority and President Donald Trump’senergy dominance agenda. The DOJ on Wednesday filed lawsuits against Hawaii and Michigan over their planned legal action against fossil fuel companies for harms caused by climate change. On Thursday, the DOJ sued New York and Vermont, challenging their climate superfund laws that would force fossil fuel companies to pay into state-based funds based on previous greenhouse gas emissions. The suits, which legal experts say are unprecedented, mark the latest of the Trump administration’s attacks on environmental work and raises concern over states’ abilities to retain the power to take climate action without federal opposition. DOJ’s court filings said the states’ plans and policies “impermissibly regulate out-of-state greenhouse gas emissions and obstruct the Clean Air Act’s comprehensive federal-state framework and EPA’s regulatory discretion.” The DOJ said the Clean Air Act — a federal law authorizing the Environmental Protection Agency to regulate air emissions — creates “a program for regulating air pollution in the United States and “displaces” the ability of States to regulate greenhouse gas emissions beyond their borders.” DOJ argued Wednesday that Hawaii and Michigan are violating the intent of the Act that enables the EPA authority to set nationwide standards for greenhouse gases, citing the states’ pending litigation against oil and gas companies for alleged climate damage. Democratic Michigan Attorney General Dana Nessel last year tapped private law firms to go after the fossil fuel industry for negatively affecting the state’s climate and environment. Meanwhile, Democratic Hawaii Governor Josh Green plans to target fossil fuel companies that he said should take responsibility for their role in the state’s climate impacts, including 2023’s deadly Lahaina wildfire. When burned, fossil fuels release emissions such as carbon dioxide that warm the planet. A spokesperson for Democratic Michigan Gov. Gretchen Whitmer’s office deferred to Nessel when asked for comment. “This lawsuit is at best frivolous and arguably sanctionable,” Nessel said in a statement, which noted that Michigan hasn’t filed a lawsuit. “If the White House or Big Oil wish to challenge our claims, they can do so when our lawsuit is filed; they will not succeed in any attempt to preemptively bar our access to make our claims in the courts. I remain undeterred in my intention to file this lawsuit the President and his Big Oil donors so fear.” Green’s office and the Hawaii Attorney General’s office did not immediately respond to requests for comment. Meanwhile, Thursday’s filings called the Superfund Act — a federal law enacted to address the harm associated with hazardous waste sites — “a transparent monetary-extraction scheme.” Trump has suggested the superfund laws “extort” payments from energy entities. “By purporting to regulate the effect of greenhouse gas emissions on climate change, the Act necessarily reaches far beyond” the states of New York and Vermont, the DOJ argued, saying it incorrectly looks to regulate nationwide and global airspace. “At a time when States should be contributing to a national effort to secure reliable sources of domestic energy,” all four states are choosing “to stand in the way,” all four filings said. In its filings, the DOJ repeated the Republican president’s claims of America’s energy emergency and crisis. But legal experts raised concern over the government’s arguments. […]