The history of Earth Day

World Today

Woman in a gas mask smelling flowers. An iconic image captured on the first Earth Day in 1970. (Photo / AP)

Earth Day began in the United States in 1970 as a national day for action on causes affecting the health of the planet – and those who live on it.

The idea for Earth Day came from Gaylord Nelson, then a U.S. senator from Wisconsin, after witnessing the devastating of an oil spill off the cast of Santa Barbara, California in 1969.

Inspired by the social movements of the 1960s, Nelson and co-founder Dennis Hayes sought to mass mobilize citizens in support of environmental causes without the crippling distraction of political or ideological divide. Earth Day would be for anyone who cared about the health of the planet and the people who live on it.

Student demonstrations at the first Earth Day in Denver, CO - 1970

Public demonstrations at the first Earth Day in Denver, CO – 1970 (Photo / AP)

The first Earth Day in the United States was held April 22, 1970. 20 million Americans from all over the social spectrum took to the streets. Events took place in two thousand colleges and universities, roughly ten thousand primary and secondary schools, and hundreds of communities across the U.S.

Senator Ed Muskie speaking at Earth Day, 1970

US Senator Edmund Muskie, author of the 1970 Clean Air Act, addressing an estimated 40,000-60,000 people for the first Earth Day in Fairmount Park, Philadelphia on April 22, 1970.

In support of the movement, Mayor of New York John Lindsay made Central Park available for Earth Day. The crowd was estimated as more than a million.

Individual environmental groups that had once been isolated in their efforts, suddenly found themselves aligned with thousands of other groups in bringing attention to their cause.

By the end of 1970, the enormous attention Earth Day brought to environmental issues had influenced the creation of the United States Environmental Protection Agency and the passage of the Clean Air, Clean Water, and Endangered Species Acts.

In 1990, Earth Day became a global operation, mobilizing over 220 million people in 141 countries. Uniting groups and everyday people, the joined movement helped lead to the 1992 United Nations Earth Summit in Rio de Janeiro. Other international conferences would soon follow where governments and industry alike joined the science community in search for common solutions to Earth’s challenges.

Today, Earth Day is celebrated by over a billion people worldwide – uniting over 5,000 groups in 192 countries to common cause. Forty-six years later, the movement still seeks to transcend political and social differences, and take action for the health of the planet – and those who live on it.