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Earth Day - Wikipedia
Earth Day: The Official Site | EARTHDAY.ORG
Earth Day - National Geographic Society
What is Earth Day, when is it and what has it achieved? - BBC
Earth Day | Definition, History, & Facts | Britannica
The History of Earth Day - Earth Day
Earth Day 2021 - Restore Our Earth™ | EARTHDAY.ORG
Earth Day 2024 ‑ Origins, Theme, Celebration - HISTORY
Earth Day - NASA Science
Earth Day: When is it and why do we celebrate it? | Live Science