Earthday.org coordinates Earth Day worldwide and was formerly known as the Earth Day Network. It connects environmental campaigns, educational programs, cleanups, and advocacy efforts held across many countries.
The organization’s roots lie in the international expansion of Earth Day. Denis Hayes, who helped organize the first 1970 event, led the 1990 anniversary campaign, which mobilized about 200 million people in 141 countries. That global expansion helped turn Earth Day from a U.S. environmental teach-in into an international civic observance.
Earthday.org is not the Sierra Club, Greenpeace, or the World Wildlife Fund. Those are major environmental organizations with their own missions and programs, while Earthday.org is specifically associated with coordinating the global Earth Day movement.
Its campaigns have addressed climate literacy, clean energy, reforestation, pollution, plastics, and community action. The organization’s name is written as Earthday.org, although older references and historical accounts commonly use Earth Day Network.