Earth Day started as a US 'teach-in' 56 years ago. Now it's a global event
- Posted on April 21, 2026
- By The Toronto Star
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- 1 min read
Earth Day started as a US 'teach-in' 56 years ago. Now it's a global event

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