- National Earth Day website
- Calculate your Carbon Footprint at CarbonCounter.org
- Co-op America: "our mission is to harness economic power - the strength of consumers, investors, and businesses - to create a socially just and environmentally sustainable society."
- Heifer International: striving to end hunger and care for the Earth
- Sierra Club, "working together to protect our communities and the planet"
- World Wildlife Federation protecting animals and people across the planet
- Audobon - "protecting our great natural heritage"
- National parks Conservation Association "protecting our national parks for future generations"
- Student Conservation Association hosting Earth Vision April 24-27 in Washington, DC
- The Trust for Public Land - "Conserving land for People"
- Environmental Defense Fund - "finding the ways that work"
- Earthjustice - "because the earth needs a good lawyer"
- American Rivers - "thriving by nature"
- Friends of the Earth - "we champion a healthy and just world"
- Natural Resources Defense Council - "the earth's best defense"
- Alaska Conservation Foundation - "strategic leadership and support for Alaskan efforts to take care of wild lands, waters, and wildlife, which sustain diverse cultures, healthy communities, and prosperous economies"
- Washtenaw Land Trust - "protecting our land, preserving our legacy"
- Preserve Washtenaw - "By working together, we can make the best use of scarce resources, and help landowners throughout the county find the best fit for them and their land."
- Southeastern Michigan Land Conservancy: "conserves natural land and open space -- including forests, wetlands, meadows, agricultural land, and places of scenic beauty -- to provide habitat for wildlife and to enrich the lives of people."
- National Wildlife Federation's Energy Solutions Fact Sheet