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Earth Day: The Official Site | EARTHDAY.ORG
Earth Day - Wikipedia
The History of Earth Day - Earth Day
Earth Day 2024 ‑ Origins, Theme, Celebration - HISTORY
Earth Day - National Geographic Society
Earth Day 2021 - Restore Our Earth™ | EARTHDAY.ORG
Why do we celebrate Earth Day on April 22?
Earth Day | Definition, History, & Facts | Britannica
The first Earth Day | April 22, 1970 - HISTORY
Earth Day | US EPA - U.S. Environmental Protection Agency