The court holds that the U.S. Fish and Wildlife's (FWS') decision that the westlope cutthroat trout (WCT) did not warrant listing as an endangered or threatened species was arbitrary and capricious.

The court holds that the Surface Mining Control and Reclamation Act (SMCRA) §1272(e) prohibits subsidence and underground mining activities that might lead to subsidence in parks and protected areas.

The court affirms a February 2001, district court order requiring the U.S. Environmental Protection Agency (EPA) to make an air quality attainment status determination for the St.

The court reverses a district court holding that an environmental group's National Environmental Policy Act (NEPA) claims against the U.S.

The court holds that all of an individual's claims for damages are based on a pesticide's label and are, therefore, preempted by the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).

The court upholds the U.S.

The court affirms a district court holding that where compensation was paid long after a taking, an individual was entitled to prejudgment interest, but remands the case for a redetermination of the amount of interest to be awarded.

The court holds that the U.S. Environmental Protection Agency (EPA) did not err when it refused to object to a county health district's issuance of a Clean Air Act (CAA) operating permit to a business.

The court holds that the New York Air Pollution Mitigation Law is preempted by the Clean Air Act (CAA) and violates the U.S. Commerce Clause.

The court holds that some of an environmental group's challenges to the National Marine Fisheries Service (NMFS) Endangered Species Act (ESA) take prohibition exemptions regarding salmon are not ripe, and that the NMFS was not arbitrary or capricious in promulgating the ESA §4(d) rule.