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Earth Day started as a US 'teach-in' 56 years ago. Now it's a global event
- April 21, 2026 at 5:20 PM
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Millions of people around the world will pause Wednesday, at least for a moment, to mark Earth Day. It's an annual event founded by people who hoped to stir activism to clean up and preserve a planet that is now home to some 8 billion humans and assorted trillions of other organisms.
Originally published at Phys.org