| National Wildlife Refuge Association | DC |
| Sierra Club | DC |
| Wilderness Society | DC |
| Union of Concerned Scientists | DC |
| Church & Society, The United Methodist Church | DC |
| Greenpeace USA | DC |
| Government Accountability Project | DC |
| Wildlands Network | DC |
| World Wildlife Fund | DC |
| US PIRG | DC |
| Larch Company | DC |
| League of Women Voters of the US | DC |
| Connecticut Association of Conservation and Inland Wetlands Commissions | CT |
| Cetacean Society International | CT |
| Friends of Animals | CT |
| Boulder Rights of Nature | CO |
| CU Wildlife Club | CO |
| Earth Guardians | CO |
| Earth Law Center | CO |
| Great Old Broads for Wilderness | CO |
| Naropa University | CO |
| Pandas International | CO |
| People and Pollinators Action Network | CO |
| Rocky Mountain Wild | CO |
| WILD Foundation | CO |
