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Cleaning up America's rivers

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.

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 remove more than 7 million pounds of garbage from 23 rivers across the country.