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Today, Earth Day 2025 marks its 55th anniversary with over one billion people participating worldwide across more than 190 countries, making it one of the largest civic observances globally, according to the Earth Day organization.

This year’s theme, “Our Power, Our Planet,” emphasizes the critical role of renewable energy in achieving global sustainability. The campaign calls for a systemic shift in energy production, aiming to accelerate clean electricity generation by 2030.

Origins Rooted in U.S. Environmental Action

The concept of Earth Day first emerged on April 22, 1970, initiated by U.S. Senator Gaylord Nelson in response to rising concerns over environmental degradation, particularly the oil spill off the coast of California in 1969. The event mobilized 20 million Americans and led to significant legislative reforms, including the Clean Air Act, Clean Water Act, and the Endangered Species Act.

By 1990, Earth Day expanded internationally, drawing 200 million participants from 141 countries. This global momentum contributed to the success of the 1992 United Nations Earth Summit in Rio de Janeiro, which focused on sustainable development and environmental protection.