Modern & International Observances
Earth Day
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<holidayfyi-glossary slug="earth-day"></holidayfyi-glossary>An annual environmental observance on April 22, first held in 1970 in the United States and now observed in more than 193 countries coordinated by Earth Day Network. Earth Day mobilizes over one billion people annually in activities such as tree planting, clean-up campaigns, and policy advocacy. It has spurred major environmental legislation including the creation of the US Environmental Protection Agency.