Earth Day, founded in 1970, is a global event that raises awareness about environmental issues. Celebrated on April 22, events include rallies, cleanups, and educational programs. Originated by former Wisconsin Sen. Gaylord Nelson, Earth Day has sparked environmental legislation and inspired young people. The event’s popularity among college students led to its date, April 22. Earth Day has been celebrated on various days globally, with the United Nations recognizing it on the vernal equinox around March 21.