- Audubon Society of Portland
- Discusses detailed birding information, nature viewing sites, classes, natures\, and newsletter.
- Berry Botanical Garden
- Promotes indigenous plants, conserves endangered species, and offers related educational opportunities.
- Endangered Species Act Program
- Provides details on Endangered Species Program’s projects, reports, education, and volunteer opportunities.
- Friends of Forest Park
- Preserves and improves Forest Park, a 5,000-acre park full of nature and biking trails in the heart of Portland.
- GoBiodiesel Cooperative
- Collects and converts waste vegetable oil into usable fuel. Includes educational resources news, and calendar of events.
- Hoyt Arboretum
- Provides nature-focused instruction and information about trails, classes, events, and volunteering.
- Japanese Garden
- Internationally renowned garden blends traditional Japanese organization with American styles.
- Johnson Creek Watershed Council
- Discusses information on events, projects, resources, and issues facing the Johnson Creek Watershed. Contains calendar of events, volunteer opportunities, and links to other watershed organizations.
- Macaw Landing Foundation
- Provides public education, ecotourism, and research for macaws’ preservation.
- Office of Sustainable Development
- Promotes the use of renewable energy and resources, conservation, waste reduction, and pollution prevention.
- Oregon Sierra Club
- A non-profit organization dedicated to the conservation of natural environment by influencing public policy decisions.
- Oregon Trout
- Presents an organization whose mission is to protect and restore native wild fish and the ecosystems that sustain them.
- Portland Parks and Recreation
- Organizes and maintains neighborhood, regional, and urban parks and botanical gardens, and offers classes in various activities.
- Sustainable Ecosystems Institute
- Offers scientific resource for individuals, organizations, and governments seeking solutions to natural resource issues.
- Volunteers in the Gorge
- Presents variety of places to visit, trails to hike and bike, and place to enjoy solitude. Includes information on events, habitat, and photo gallery.
- World Forestry Center
- Provides information about the World Forestry education, exhibits and programs. Contains information on internal programs and research activities.
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