American Museum of Natural History. (2022, April 17). Earth Day 1970–2022: What's Changed? [Video]. Youtube. https://youtu.be/PL31i1cu22U?si=jL3d498IRGYW9GnF
An annual observance of the need to protect the natural environment, held on April 22. Conceived by Senator Gaylord Nelson of Wisconsin, the first Earth Day was held in 1970, organized by environmentalist Dennis Hayes, who has continued in this role ever since. The concept caught the imagination of many Americans, especially students, and some 20 million people participated in Earth Day demonstrations that first year, including 10,000 grade and high schools, 2,000 colleges, and 1,000 communities. Congress adjourned for the day so that members could speak at environmental rallies in their districts. At the 30th anniversary of Earth Day, in 2000, the theme was clean energy and the need to deal with global change stemming from the use of fossil fuel. Many magazines and television programs were devoted to the event, including a special issue of Time (April-May 2000).
Ashworth, W., & Little, C. E. (2001). Earth Day. In Encyclopedia of Environmental Studies, New Edition. New York: Facts On File. Retrieved June 22, 2021, from online.infobase.com/Auth/Index?aid=15050&itemid=WE40&articleId=307360.