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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
What is Earth Day, when is it and what has it achieved? - BBC
This is the story of the first Earth Day—and why it mattered
Earth Day | Smithsonian Institution
50 Years of Earth Day: What’s Better Today, and What’s Worse