Astronomers of HumboldtAmateur astronomers hosting public presentations and public observing sessions. Club members and their equipment are available as a public service for educational, charitable, and school groups.
Green WheelsInformation on sustainable transportation options including buses, bikes, and rideshare links. Advocacy organization for developing sustainable transportation.
North Coast Chapter of the California Native Plant SocietyAn organization of amateurs and professionals dedicated to the preservation of California's native flora. Arcata.
Environmental Protection Information CenterOrganization working to protect biodiversity and ancient forests. Garberville.