Earth Day 2000 activism took place in 184 countries.
The 2000 observance was the first Earth Day of the new millennium and focused on global warming and clean energy. Organizers used the emerging internet to help environmental groups communicate across borders, while 5,000 participating organizations coordinated campaigns, demonstrations, and educational activities.
The figure of 184 refers specifically to the countries where activism was reported in 2000. It should not be confused with the 141 countries involved in the major international Earth Day campaign of 1990, which helped transform the event from a largely American observance into a global movement.
Earth Day began in the United States on April 22, 1970, after Senator Gaylord Nelson and organizer Denis Hayes promoted a nationwide environmental teach-in. The movement later expanded into climate campaigns, cleanups, tree planting, environmental education, and online actions worldwide.