The Second Circuit affirmed in part and dismissed in part a district court ruling in a lawsuit brought by an oil company against the New York and Massachusetts attorneys general. The company had argued the states' investigations into the company's allegedly deceptive speech concerning climate change...

A district court granted states’ motion to preliminarily enjoin federal agencies from implementing the Biden Administration’s interim estimates on the social costs of greenhouse gas emissions. The states argued the president lacked authority to promulgate and enforce the estimates or to consider...

The Tenth Circuit affirmed a district court’s order remanding to state court a climate liability lawsuit against fossil fuel companies. Municipalities in Colorado argued in state court that they faced substantial and rising costs from the threat of climate change, to which the companies had substa...

The Alaska Supreme Court affirmed, 3-2, a lower court's dismissal of a climate liability lawsuit brought against the state of Alaska. Alaskans argued the state's natural resource development was contributing to climate change and adversely affecting their lives. The lower court dismissed the suit, c...

A district court granted Delaware's motion to remand to state court its climate liability lawsuit against fossil fuel companies. Delaware argued it had suffered, and would continue to suffer, damages from climate impacts caused by the companies' denial of and disinformation about the existence, caus...

The D.C. Circuit granted a trade group's petition to review a 2016 rule issued by EPA and the National Highway Traffic Safety Administration that set greenhouse gas emissions and fuel efficiency standards for medium- and heavy-duty engines and vehicles. The group challenged the agencies' authority t...

A district court remanded to state court a climate liability lawsuit brought by the city of Hoboken, New Jersey, against large oil and gas companies. The city filed suit in state court, alleging the companies' decades-long campaign to downplay the effect of fossil fuel usage on climate change had da...

A district court dismissed a challenge to the president's Executive Order No. 13990, which established an interagency working group on the social cost of greenhouse gases (GHGs) and directed the group to publish interim estimates for the social costs of GHG emissions. Thirteen states challenged the ...

A district court remanded to state court a climate liability lawsuit brought by the state of Connecticut against an oil company. Connecticut sued the company in state court, asserting eight claims under the Connecticut Unfair Trade Practices Act. The company removed the suit to federal court based o...