Earth Day
Annual April 22 event demonstrating support for environmental protection.
Every year on April 22, people around the world mark Earth Day to show they care about protecting the environment. The first Earth Day happened on April 22, 1970, and today it’s a global event coordinated by earthday.org, with about 1 billion participants across more than 193 countries. The idea came from several directions. In 1969, peace activist John McConnell suggested a day for the Earth and peace at a UNESCO conference in San Francisco, proposing March 21, 1970—the first day of spring in the northern hemisphere. That date was later endorsed by a United Nations proclamation written by McConnell and signed by Secretary General U Thant. Meanwhile, U.S. Senator Gaylord Nelson pushed for a nationwide environmental teach-in on April 22, 1970, and hired young activist Denis Hayes to run it. The name “Earth Day” came from advertising writer Julian Koenig. Hayes and his team expanded the event beyond a simple teach-in to cover the entire United States.
Key partners outside the environmental movement were crucial. The United Auto Workers, led by Walter Reuther, provided the most important financial and operational support for the first Earth Day. Hayes later said that without the UAW, the first Earth Day would likely have failed. Nelson received the Presidential Medal of Freedom for his work. The first Earth Day focused only on the United States. In 1990, Denis Hayes took the event global, organizing activities in 141 nations. On Earth Day 2016, the United States, the United Kingdom, China, and 120 other countries signed the landmark Paris Agreement, meeting a key requirement for the climate protection treaty to take effect. Many communities now hold “Earth Day Week actions,” a full week of events about environmental issues. On Earth Day 2020, more than 100 million people marked the 50th anniversary, making it the largest civic observance in the world.
The 1969 Santa Barbara oil spill helped spark the movement. On January 28, 1969, a Union Oil well called Platform A, located 6 miles off the California coast, blew out. Over 3 million gallons of oil spilled, killing more than 10,000 seabirds, dolphins, seals, and sea lions. Activists responding to the disaster—including Selma Rubin, Marc McGinnes, and Bud Bottoms, who founded Get Oil Out—pushed for environmental regulation, education, and Earth Day. Denis Hayes said Senator Nelson was inspired to create Earth Da
- first_observed
- April 22, 1970
- founder_proponents
- John McConnell, Gaylord Nelson, Denis Hayes
- global_reach
- Over 193 countries, 1 billion participants
- key_early_supporter
- United Auto Workers (UAW) under Walter Reuther
- associated_treaty
- Paris Agreement signed on Earth Day 2016
- largest_observance
- World's largest civic observance as of 2020
Lore & Background
The seeds that grew into the first Earth Day were planted by many people, including Wisconsin senator Gaylord Nelson. An ardent conservationist and former two-term governor of Wisconsin, Nelson had long sought ways to increase the potency of the environment as a political issue. The extraordinary attention garnered by Rachel Carson's 1962 book Silent Spring, the famous 1968 Earthrise NASA photograph of the Earth from the Moon, and the saturation news coverage given to the Santa Barbara oil spill and the Cuyahoga River catching fire in early 1969 led Nelson to think the time was ripe for an environmental initiative. Nelson asked public interest lawyer Anthony Roisman to establish a non-profit, Environmental Teach-In, Inc., and recruited a small board of directors, including Republican congressman Pete McCloskey as co-chair.
Reader's Guide
Earth Day's significance lies in its transformation from a U.S.-focused teach-in into the world's largest civic observance, mobilizing hundreds of millions of people across more than 193 countries. The first Earth Day in 1970 was heavily supported by the United Auto Workers under Walter Reuther, without which, according to organizer Denis Hayes, it 'would have likely flopped.' The event catalyzed environmental legislation and awareness, with the 2016 Paris Agreement signed on Earth Day by the United States, United Kingdom, China, and 120 other countries. Its legacy includes the annual coordination of events by earthday.org and the engagement of entire communities in 'Earth Day Week actions.' The 50th anniversary in 2020 saw over 100 million people worldwide participating, cementing its role as a global platform for environmental advocacy.
Did You Know?
- The name 'Earth Day' was coined by advertising writer Julian Koenig.
- The first Earth Day was focused on the United States; it went international in 1990 under Denis Hayes, with events in 141 nations.
- Senator Gaylord Nelson was awarded the Presidential Medal of Freedom for his work on Earth Day.
- The 1969 Santa Barbara oil spill, which killed over 10,000 seabirds, dolphins, seals, and sea lions, helped inspire the creation of Earth Day.
Frequently Asked Questions
Who started Earth Day?
The idea traces back to peace activist John McConnell, who proposed a dedicated day for the planet at a 1969 UNESCO conference in San Francisco. Senator Gaylord Nelson then organized the first large-scale public event, with Denis Hayes serving as the student coordinator who helped turn it into a nationwide reality.
What is Earth Day's role in the world?
Earth Day functions as the world's largest civic observance, gathering roughly 1 billion participants across more than 193 countries to demonstrate support for environmental protection. It serves as a recurring annual platform for advocacy, education, and collective action on ecological issues.
How did Earth Day's story begin?
The first Earth Day took place on April 22, 1970, when millions of Americans joined rallies, teach-ins, and community events demanding stronger environmental protections. The United Auto Workers, under Walter Reuther, were among the earliest major organizations to lend their support to the cause.
Why is Earth Day important?
Earth Day gave the environmental movement a unifying annual date that transcends politics and borders, turning abstract ecological concerns into a shared global celebration. It has also served as a symbolic backdrop for major policy moments, such as the Paris Agreement being signed during the 2016 observance.
When and where is Earth Day celebrated?
Earth Day is observed every year on April 22, a date chosen to maximize participation during the northern hemisphere's spring season. It is coordinated globally through earthday.org and takes place in over 193 countries, making it one of the most widely attended civic events on the planet.
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