Northcoast Environmental Center (NEC)
- The NEC, created in February 1971, is one of the most influential and certainly the oldest coalition: educating, agitating and litigating on behalf of the environment in the Klamath~Siskiyou region of northwestern California.
- http://www.necandeconews.to/

Berkeley Digital Seismic Network - Arcata
- Seismic study site on the campus of Humboldt State University, under the auspices of the Geology Department.
- http://www.seismo.berkeley.edu/seismo/bdsn/station_book/arc.html

Institute for Ecological Tourism
- Promotes stewardship of natural resources through carefully planned and executed ecotourism development which emphasizes education and research while assuring minimal impact on natural and cultural resources.
- http://www.humboldt.edu/~ecotour/