Earth Day

Every April 22, more than a billion people across nearly 200 countries mark Earth Day, a coordinated show of support for environmental protection. What began as a single day of American demonstrations has grown into what organizers call the largest secular observance in the world.

Where Earth Day came from

Earth Day traces back to 1970 and US Senator Gaylord Nelson of Wisconsin, who wanted to force the environment onto the national political agenda. Inspired by the anti-war teach-ins of the era, Nelson recruited a 25-year-old organizer named Denis Hayes to coordinate a nationwide event, and deliberately scheduled it for a weekday between spring break and final exams to draw the largest possible student turnout.

The first Earth Day, on April 22, 1970, drew an estimated 20 million Americans — roughly one in ten people in the country — to rallies, cleanups, and campus teach-ins. The response was strong enough to reshape US policy: within the same year, the federal government created the Environmental Protection Agency, and the era soon produced the Clean Air Act, the Clean Water Act, and the Endangered Species Act.

For two decades Earth Day remained largely American. That changed in 1990, when Hayes organized a global campaign that brought some 200 million people in 141 countries into the movement. The day has carried diplomatic weight since: in 2016, the Paris Climate Agreement was opened for signature on Earth Day, when a record 175 nations signed on a single afternoon at United Nations headquarters.

How the day is marked

Modern Earth Day looks less like a protest and more like a global work session. Communities organize park, beach, and river cleanups; schools and neighborhoods plant trees; and cities host teach-ins, fairs, and sustainability pledges. EarthDay.org, the nonprofit that coordinates the worldwide effort, sets an annual theme — recent years have focused on plastics, climate education, and restoring ecosystems — that gives local events a shared focus.

For many people the day is also personal: a prompt to start composting, switch to reusable goods, plant a native garden, or simply learn how a local watershed works. None of it requires a grand gesture, which is part of the point. Earth Day was designed from the start to turn broad concern into concrete, visible action.