- Caretakers of the Environment International/USA
- Cornell Lab in Ornithology
- Cornell University Cooperative Extension
- Environmental Concern-Wetlands Education
- Environmental Organization Web Directory
- Environmental Protection Agency
- EPA Environmental Education Center
- EPA High School Environmental Center
- GLOBE Program
- International Education and Resource Network
- Kids Go Wild
- National Audubon Society
- National Council for Science and the Environment
- National Environmental Education and Training Foundation
- National Sanitation Foundation
- National Science Foundation
- National Wildlife Federation- Environmental Education
- New England Environmental Education Alliance
- New York Regional Association of Grantmakers
- North American Association of Environmental Education
- Place-Based Education Evaluation Collaborative
- Project Learning Tree
- Project Wet
- Project Wild
- Sencer
- Sharing Nature
- Teens for Planet Earth
- The Green School Project
International Organizations
- International Union for the Conservation of Nature
- UN Commission on Sustainable Development
- UN Development Programme
- UN Environmental Programme