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On the first Earth Day, Terry Seuss, 14, cleans up soda and beer cans on Route 17 in Hohokus, N.J., April 22, 1970. (Photo by Jerry Kinstle/NY Daily News/Getty)

What the original Earth Day can teach us

Forty-five years ago, on April 22, 1970, an estimated 20 million people took to the streets for the first ever Earth Day. It was the largest public demonstration in United States history and helped turn environmentalism into a mass social movement for the first time. Today, Earth Day is known for feel-good concerts, eco-fairs, or recycling...

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