The D.C. Circuit denied the state of Utah's motion to stay EPA's 2023 "good neighbor" rule, which aims to ensure that 23 states meet the CAA's good neighbor requirements by reducing ozone-forming emissions of nitrogen oxides from power plants and industrial facilities that contribute to compliance i...

A district court granted summary judgment for several bus companies in a CAA citizen suit alleging that the companies excessively idled their buses in violation of Massachusetts and Connecticut law. The companies moved for summary judgment, asserting the group lacked standing. The court found the co...

A district court granted the state of Louisiana's and oil and gas companies' motions to preliminarily enjoin the Bureau of Ocean Energy Management's (BOEM's) withdrawal of six million acres from, and addition of a term to, an oil and gas lease sale on the outer continental shelf in the Gulf of Mexic...

The Tenth Circuit, 2-1, granted in part an environmental group's challenge to EPA's approval of a Colorado SIP revision certifying that the state's existing, EPA-approved nonattainment new source review permitting program for the Denver Metro-North Front Range area met the requirements for attaining...

A district court dismissed a mining company's challenge to DOI's cancellation of two leases for a proposed copper and nickel mine in Superior National Forest. The company argued the cancellation violated the company's right to successive lease renewals and to be free from government action that is a...

The Ninth Circuit affirmed a district court's denial of a preliminary injunction to halt two projects to thin vegetation in Yosemite National Park in preparation for controlled burns. An environmental group had argued NPS violated NEPA by approving the projects without conducting a full review of th...

The Ninth Circuit affirmed denial of fishing rights to the Lummi Nation in a long-running dispute over rights in certain waters in northern Washington. The Swinomish Indian Tribal Community, the Tulalip Tribes, and the Upper Skagit Indian Tribe argued that the recognized fishing rights of the Lummi ...

The Fifth Circuit denied environmental groups' petition to review the Army Corps of Engineers' issuance of a CWA permit for a proposed liquefied natural gas production and export terminal on the Calcasieu River in Louisiana. The groups argued the Corps failed to adequately consider a particular alte...

A district court granted summary judgment for environmental groups in a challenge to FWS' 12-month finding and determination that the eastern hellbender did not warrant listing as a threatened or endangered species under the ESA. The groups argued FWS failed to articulate a rational and legal basis ...

The Tenth Circuit affirmed denial of a preliminary injunction in a challenge to the Office of Natural Resources Revenue's (ONRR's) 2016 rule changing how royalties were calculated for oil and natural gas produced on federal land. A trade group argued the rule was arbitrary and capricious, in violati...