- California Planning and Conservation League - A non-profit environmental group protecting California's natural resources through direct political and legislative action.
- Homepage of the Palos Verdes Peninsula Land Conservancy - Dedicated to the preservation of natural open space on the Palos Verdes Peninsula in Los Angeles County, California.
- The Land Conservancy of San Luis Obispo County - A land trust on California's Central Coast. Preserving open space, wetlands, and threatened species habitat.
- Marin Agricultural Land Trust - Preserves agricultural land in western Marin County; educates public about agriculture and need to preserve it
- Midpensinsula Regional Open Space District - MROSD maintains 41,000 acres of Bay Area preserves with 200 miles of ow-intensity recreational trails, e.g. hiking.
- Palos Verdes Peninsula Land Conservancy - Preserving open space on California's Palos Verdes Peninsula
- San Gorgonio Volunteer Association - A non-profit organization dedicated to protecting the San Gorgonio Wilderness & San Bernardino National Forest in Southern California
- Wildlands Restoration Team - Volunteer group doing habitat restoration in the SantaCruz mountains
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