Conservation
- British Trust for Conservation Volunteers (BTCV)
- California Environmental Resources Evaluation System
- Envirolink Network, The
- Nature Conservancy, The
- NatureServe
- Sierra Club
- World Conservation Monitoring Centre
Energy
- Center For Sustainable Energy, California
- International Solar Energy Society
- Northeast Sustainable Energy Association
- Pacific Rim Consortium in Energy, Combustion, & the Environment (PARCON)
- Solar Energy Research and Education Foundation (SEREF)
Forests
- American Forests
- Canadian Sustainable Forestry Certification Coalition
- Finnish Forest Research Institute
- Forestry Research Institute of Sweden
- Green America Better Paper Project (Wood Wise)
- Heartwood
- Rainforest Action Network
Natural Resources
- Natural Resources Defense Council (NRDC)
- Resources for the Future, Inc.
- Rocky Mountain Institute
- Tellus Institute For Resource And Environmental Strategies
Oceans
- Center for Marine Conservation
- Coral Reef Alliance
- Ocean Voice International
- Oceanic Information Center
- Surfrider Foundation USA
Recycling
- Bluewater Recycling Association
- Global Recycling Network
- Recycler’s World
- Steel Alliance
- Steel Recycling Institute
Rivers
- Grand River Conservation Authority
- International Rivers Network
- Mississippi River Basin Alliance
Water
- American Water Works Association
- Association of Metropolitan Water Agencies
- Water Environment Federation
- Water For People
- Water Research Foundation
- WaterWiser
Wildlife
- Cat Tales Endangered Species Conservation Park
- National Audubon Society
- National Wildlife Federation
- Peregrine Fund, The
- Turtle Trax
- Wild Ones, The