- Alaska Wilderness League
- American Federation of Government Employees (AFGE)
- American Lung Association
- American Rivers
- American Wind Energy Association
- Backcountry Hunters and Anglers
- Chesapeake Bay Foundation
- Defenders of Wildlife
- Earthjustice
- Environment America
- Environmental Defense Fund
- Environmental Entrepreneurs (E2)
- Environmental Integrity Project
- Friends of the Earth
- League of Conservation Voters
- National Geographic
- Natural Resources Defense Council
- National Trust for Historic Preservation
- National Wildlife Federation
- Population Connection
- Sierra Club
- Taxpayers for Common Sense
- Union of Concerned Scientists
- The Wilderness Society
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