http://www.helium.com/knowledge/275493-what-is-the-main-source-of-pollution-in-americas-rivers-and-lakes-and-how-do-experts-problem.xml Helium.com > Environmental Awareness > What is the main source of pollution in America's rivers and lakes and how do experts think the problem can be resolved? en-us Copyright Helium.com Fri, 30 Oct 2009 19:35:23 GMT Fri, 30 Oct 2009 19:35:23 GMT