The initial movement in 1970 is known as the largest secular day of protest in the world.
INDIANAPOLIS — Millions around the world Wednesday will celebrate Earth Day, 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.
Earth Day is celebrated on April 22 in the United States and on either April 22 or on the spring equinox in other parts of the world.
How did Earth Day get its start?
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