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Earth Day: The Official Site | EARTHDAY.ORG
Earth Day - Wikipedia
Earth Day - National Geographic Society
Earth Day 2024 ‑ Origins, Theme, Celebration - HISTORY
Earth Day 2021 - Restore Our Earth™ | EARTHDAY.ORG
The History of Earth Day - Earth Day
Celebrate Earth Month - National Geographic Society
Earth Day - National Oceanic and Atmospheric Administration
What is Earth Day, when is it and what has it achieved? - BBC
Earth Day | Definition, History, & Facts | Britannica