528 U.S. 167 (2000) Cited 7,205 times 25 Legal Analyses
Holding that plaintiffs who curtailed their recreational activities on a river due to reasonable concerns about the effect of pollutant discharges into that river had standing
520 U.S. 968 (1997) Cited 3,383 times 2 Legal Analyses
Holding that "a plaintiff's motion for preliminary injunctive relief has a "requirement for substantial proof is much higher" than a defendant's summary judgment motion
490 U.S. 360 (1989) Cited 2,004 times 2 Legal Analyses
Holding that courts must defer to the "informed discretion" of federal agencies where the agencies’ decisions require "a high level of technical expertise" (quoting Kleppe v. Sierra Club , 427 U.S. 390, 412, 96 S.Ct. 2718, 49 L.Ed.2d 576 (1976) )
Holding that Navy's "practice of retaining Catholic chaplains past applicable age limits" constituted only "hypothetical" injury for Protestant chaplains
Holding that to establish irreparable harm the movant must "substantiate the claim that irreparable injury is 'likely' to occur. . . . Bare allegations of what is likely to occur are of no value."
16 U.S.C. § 1531 Cited 1,676 times 26 Legal Analyses
Finding and declaring that "various species of fish, wildlife, and plants in the United States have been rendered extinct" while "other species ... have been so depleted in numbers that they are in danger of or threatened with extinction ...."
16 U.S.C. § 1536 Cited 1,322 times 35 Legal Analyses
Requiring that every federal agency "insure that any action authorized, funded, or carried out by such agency . . . is not likely to jeopardize the continued existence of any endangered species or threatened species"
16 U.S.C. § 1532 Cited 870 times 33 Legal Analyses
Defining "conservation" as "the use of all methods and procedures which are necessary to bring any endangered species or threatened species to the point at which the measures provided pursuant to this chapter are no longer necessary"
50 C.F.R. § 402.02 Cited 489 times 18 Legal Analyses
Defining "action" as "all activities or programs of any kind authorized, funded, or carried out, in whole or in part, by Federal agencies in the United States or upon the high seas. Examples include, but are not limited to . . . actions directly or indirectly causing modifications to the land, water, or air"
50 C.F.R. § 424.12 Cited 70 times 14 Legal Analyses
Stating that "Secretary shall designate as critical habitat areas outside the geographical area presently occupied by a species only when a designation limited to its present range would be inadequate to ensure the conservation of the species"