- 350.org
- The Trustees of Reservations
- Appalachian Mountain Club
- Catalogue Choice
- Earth Justice
- Essex County Greenbelt Association
- Hudson River Sloop Clearwater
- Maine Audubon Society
- Massachusetts Audubon Society
- Natural Resources Council of Maine
- New England Wildflower Society
- Sierra Club
- Society for the Protection of New Hampshire Forests
- The Trust for Public Land
- The Wilderness Society
Contact the editor to suggest other listings.