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The History of Earth Day - Earth Day
Earth Day 2024 - Origins, Theme, Celebration | HISTORY
Earth Day - Wikipedia
Earth Day - National Geographic Society
Earth Day | Definition, History, & Facts | Britannica
Earth Day Timeline - 1970, Facts & First | HISTORY
This is the story of the first Earth Day—and why it mattered
The real history of Earth Day and story behind the global eco ...
Earth Day | Smithsonian Institution
About Us - Earth Day