"Earth Day, April 22, is a day on which people around the world participate in events celebrating the planet and advocating for environmental protection. Celebrated since 1970, Earth Day is an occasion for people to participate in events coordinated by the Earth Day Network, which operates in 193 different countries and involves over one billion participants. The network works to draw attention to environmental issues and to provide ways in which individuals can take meaningful action. These include actions on climate change, global teach-ins in which educators teach about environmental issues, and the Great Global Cleanup, in which volunteers around the globe clean up their own small areas. The 2020 Earth Day celebration marks the 50th anniversary of the event." - "Earth Day." Environmental Encyclopedia, edited by Deirdre S. Blanchfield, Gale, 2011. Gale In Context: Science, link.gale.com/apps/doc/CV2644150405/SCIC?u=calstate&sid=SCIC&xid=4a574b4a. Accessed 15 Apr. 2021.
Learn more about Earth Day in this New York Time's Article, The ‘Profoundly Radical’ Message of Earth Day’s First Organizer.