On Earth Day 1970 twenty million Americans displayed their commitment to a clean environment. It was called the largest demonstration in human history, and it permanently changed the nation s political agenda. By Earth Day 2000 participation had exploded to 500 million people in 167 countries.
The seemingly simple idea a day set aside to focus on protecting our natural environment was the brainchild of U.S. Senator Gaylord Nelson of Wisconsin...
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