The first Earth Day was observed across the United States
On this day · 22 April 1970
On April 22, 1970, some 20 million Americans took to streets and campuses, turning scattered environmental anger into a national movement.
On April 22, 1970, an estimated 20 million Americans poured into streets, parks, and campuses for the first Earth Day, a coordinated day of teach-ins and demonstrations against pollution. It remains one of the largest single-day protests in U.S. history.
The idea came from Senator Gaylord Nelson of Wisconsin, who wanted to channel the era’s grassroots energy into a focused conversation about the environment. He pitched it as a nationwide day for teachers and students to talk about the planet, then watched it explode far beyond schools.
Twenty million Americans demonstrated in different U.S. cities, and it worked.
The political payoff was swift. Within months, momentum from Earth Day helped spur the creation of the Environmental Protection Agency in December 1970 and underpinned landmark laws including the Clean Air Act and the Clean Water Act, reshaping American environmental policy for decades.
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