"CNN Hero Chad Pregracke has made it his life's work to clean up the Mississippi River and other American waterways. Since 1998, about 70,000 volunteers have helped Pregracke <a href=""http://www.cnn.com/2013/04/18/us/cnnheroes-pregracke-rivers-garbage/index.html"">remove more than 7 million pounds of garbage</a> from 23 rivers across the country."
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