Although none of the case could be construed a "landmark" some of them do contain significant implications for future environmental law enforcement in what one scholar called a "chipping away at the foundations" of environmental protection. Four of the five cases came from the Ninth Circuit, generally considered the most environmentally friendly:
- Entergy Corp v. Riverkeeper The Court ruled 6-3 that electric utilities may use cost-benefit analysis in regulating water cooling intake structures under the Clean Water Act;
- Coeur Alaska v. Southeast Alaska Conservation The Court ruled 6-3 that the Army Corps of Engineers has the authority to issue permits for dumping and dredging into a lake with satisfying pollution limits set by the EPA;
- Burlington Northern Railway v. US The Court ruled 8-1 that the Superfund law does not require joint and several liability in every clean up cost recovery but permits apportionment;
- Winter v. NRDC In a 6-3 decision the Court lifted an injunction against the Navy's use of sonar near marine mammals;
- Summers v. Earth Island Institute The Court decided 5-4 that environmental organizations lacked standing to challenge the exemption of salvage timber sales from notice and public comment process.