The Original Earth Day

An estimated 20 million people participated in the first Earth Day on April 22, 1970 in college and high-school auditoriums, public parks, and other venues throughout the country. Earth Day founder Gaylord Nelson, who was a U.S. senator from Wisconsin at the time, recalled 20 years later in an article in the EPA Journal that his “major objective in planning Earth Day … was to organize a nationwide public demonstration so large it would, finally, get the attention of the politicians and force the environmental issue into the political dialogue of the nation.”

“It worked,” Nelson added. “By the sheer force of collective action on that one day, the American public forever changed the political landscape regarding environmental issues.”...