The Court reversed the Fourth Circuit's grant of summary judgment in favor of a coal-fired power plant operator charged with violating the Clean Air Act's (CAA's) prevention of significant deterioration (PSD) regulations. The CAA's PSD and new source performance standards (NSPS) provisions both cove...

The Ninth Circuit affirmed a lower court decision that the Clean Air Act (CAA) does not preempt certain provisions of local "fleet rules" requiring operators to meet specified emission standards or engine requirements, but reversed and remanded the court's refusal to consider whether the CAA preempt...

The Ninth Circuit upheld an injunction enjoining the California Air Resources Board from enforcing state regulations that limit emissions from the auxiliary diesel engines of ocean-going vessels within 24 miles of California's coast. Clean Air Act (CAA) §209(e)(2)(A) requires California to obta...

A district court held that the applicable legal test for the "routine maintenance, repair, and replacement" exclusions found in the Clean Air Act (CAA) should be applied to activities that are considered "routine in the industry" rather than "routine at the unit." In a CAA enforcement action filed a...

The court holds that the U.S. Forest Service did not violate the National Environmental Policy Act (NEPA) by classifying certain units of a proposed timber sale as roaded. Because the Forest Service considers the challenged units as roaded, the studies and research that formed the basis for the envi...

The court affirms a district court's orders denying environmental groups' motions to enjoin timber sales as violative of the Wild and Scenic Rivers Act (WSRA) and the Migratory Bird Treaty Act (MBTA). The court first holds that the district court properly denied the environmental groups' motions to ...

The court holds that a U.S. Forest Service timber sale on the George Washington National Forest in Virginia was not arbitrary and capricious and did not violate the National Forest Management Act (NFMA) or the National Environmental Policy Act (NEPA) as alleged by a neighboring landowner. The court ...

The court upholds the U.S. Forest Service's decision to grant a cellular phone company a special use permit for a telecommunications facility on Dead Indian Mountain in the Fremont National Forest, Oregon. The court first holds that the Forest Service's decision to grant the permit was not arbitrary...

The court holds that a consent judgment under which the United States acquired title to Horn Island in the Gulf of Mexico is null and void. Plaintiff-appellants had contracted to sell a portion of the island to the United States, which sought it as part of a proposed national park. The United States...

The court holds that an interdepartmental memorandum of agreement that provides for a 20-day public comment period for environmental assessments prepared for timber salvage sales in the Hoosiers National Forest is valid under the Rescissions Act. The court holds that the Rescissions Act authorizes t...