What happened in the 1960s?
π Earth Day inception (1970)
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Further Reading
The History of Earth Day (earthday.org)
Earth Day Timeline - 1970, Facts & First | HISTORY (history.com)
π Happy Earth Day! π± Since its inception in 1970, Earth ... - Facebook (facebook.com)
This Day in History: The first Earth Day held in 1970 - KOCO (koco.com)
EPA History: Earth Day (epa.gov)
Earth Day Evolution: From 1970 Activism to Global Phenomenon ... (youtube.com)
On this day in history, April 22, 1970, first Earth Day is celebrated (yahoo.com)
Amazon on LinkedIn: Ever wonder why Earth Day is held on April 22 ... (linkedin.com)
What the Lorax movie and history of Earth Day have in common (youtube.com)