Here are 10 essential things you must know about Earth Day as the world marks its 56th observance on Wednesday, April 22, 2026, under the theme "Our Power, Our Planet."

1. Earth Day was born from environmental disasters and activism in 1970. U.S. Senator Gaylord Nelson of Wisconsin founded the first Earth Day after witnessing the devastating 1969 Santa Barbara oil spill and growing concerns over pollution, including deadly smog and pesticides highlighted in Rachel Carson's "Silent Spring." Inspired by anti-Vietnam War teach-ins, Nelson recruited activist Denis Hayes to organize a national "environmental teach-in." On April 22, 1970, more than 20 million Americans participated in rallies, cleanups and demonstrations across the country, shutting down Fifth Avenue in New York and filling streets in major cities. The massive turnout is credited with launching the modern environmental movement.

2. The date April 22 was chosen strategically to maximize participation. Organizers selected a weekday between spring break and final exams to encourage college students to get involved. The choice proved successful, drawing young people into environmental advocacy and helping build broad public support that led to swift legislative action.

3. The first Earth Day directly spurred major U.S. environmental laws and institutions. By the end of 1970, the U.S. government created the Environmental Protection Agency (EPA) and the National Oceanic and Atmospheric Administration (NOAA). The........

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