Earth Day was first observed on April 22, 1970, when an estimated 20 million people nationwide attended the inaugural events at tens of thousands of sites including elementary and secondary schools, universities, and community sites across the United States. Senator Gaylord Nelson promoted Earth Day, calling upon students to fight for environmental causes and oppose environmental degradation with the same energy that they displayed in opposing the Vietnam War. By the twentieth anniversary of the first event, more than 200 million people in 141 countries had participated in Earth Day celebrations. The celebrations continue to grow. (Library of Congress)
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