Earth Day Facts: When It Is, How It Began, What to Do

Publication: National Geographic News   Date: April 20, 2009   View Article

From not-so-humble beginnings in 1970, when 20 million participated across the U.S., Earth Day has grown into a global tradition, with a billion expected to take part in 2009. Find out when it is, how it started, how it’s evolved, and what you can do.

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