Scientists say Great Lakes are cleansing themselves

TORONTO – Canadian and U.S. scientists say they have proof the world's biggest fresh water system, the Great Lakes straddling Canada and the United States, are cleansing themselves of pollutants, and they are planning tests to see if the same is true in the Arctic.
http://www.planetark.org/dailynewsstory.cfm/newsid/12632/story.htm

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