USA
- EcoWatch - uniting the grassroots environmental movement
- Friends of the Earth - USA
- Stanford Woods Institute for the Environment
- Friends of the Earth Action - USA
- National Wildlife Federation
- Greenpeace - USA
- Climate Action Network - USA
- Indigenous Environmental Network - USA
- Earth Track - is your primary source for understanding and monitoring environmentally-harmful subsidies.
- Ecosocialist Horizons - USA
- National Resources Defense Council (NRDC)
- NRDC - Reference / Links
- Food & Water Watch - Washington
- Americans against Fracking - USA
- The Nature Conservancy
- National Audubon Society
- Second Nature
- Greenpower Partnership - EPA
- Global Green - Santa Monica
- Environmental Defense
- Co-op America's Green Pages
- System Change Not Climate Change Coalition
- Rocky Mountain Institute (RMI)
- Cary Institute of Ecosystem Studies
- Environmental Research Foundation
- Environmental Working Group
- EcoWatch
- Organic Consumers
- National Wildlife Federation
- Indigenous Environmental Network
- Native Americans and the Environment (Archive)
- Earth Policy Institute (Lester Brown)
- Earth Action
- Earth Justice
- Earth Rights International
- Protecting our Waters
- Orion Society
- Mindfully.org
- Green For All
- Tree Hugger
- Green For All
- Tar Sands Resistance - tw
- Deep Green Resistance
- Environment America Center
- Public Employees for Environmental Responsibility (PEER)
- Wild Gift - for environmental entrepreneurs
- Healthy Environment ALliance of Utah (HEAL)
- Safe2Use: Nontoxic Natural Products and Services
- California Air Resources Board
- Centre for Science and Environment (CSE)
- Ecology Channel (USA)
- Global Eco-Village Network
- Global Justice Ecology Project
- Earth Share of Washington
- Mother's Alert - Toward a Liveable World for Our Children
- Catskill Mountainkeeper
- Bullfrog Films - Environmental and Educational Videos
- Environmental Geography Pages by James Hayes-Bohanan
- League of Conservation Voters - Dirty Dozen Campaign (Archive)
- Earth Day Energy Fast (Archive 2004)
- Green Scissors '99 Report: Energy Section (Archive)
- Sea Sheppard Conservation Society - International Head Office - USA
- Amazon Watch
- Music Saves Mountains Campaign
- Hug A Tree Challenge
- The 11th Hour Project
- ThinkProgress