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The greenest parks in America

beautiful blue water with mountains in background and glaciers

Photo: Andrew Kalat/Flickr

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Glacier National Park

Glacier National Park in Montana makes the list, thanks to its innovations with climate-change education. Since 1850, many of the park's glaciers have shrunk substantially, and the park is doing its best to teach people about the effects of global warming, all the while keeping its own sustainable practices.