Bing found the following results
Earth Day: The Official Site | EARTHDAY.ORG
Earth Day - Wikipedia
The History of Earth Day - Earth Day
Earth Day 2021 - Restore Our Earth™ | EARTHDAY.ORG
Earth Day 2024 - Origins, Theme, Celebration | HISTORY
Earth Day - National Geographic Society
Earth Day | Definition, History, & Facts | Britannica
What is Earth Day, when is it and what has it achieved? - BBC
What is Earth Day, when is it and what has it achieved? - BBC
What to know about Earth Day and how it came to be | AP News