Self purification
canadian and usa-based scientists say the world's biggest fresh water system, the Great Lakes, straddling Canada and the United States, are cleansing themselves of pollutants. The scientists are planning tests to see if the same is true in the Arctic.
The unusual phenomenon was discovered by the bi-national Integrated Atmospheric Deposition Network (iadn), which says that tests since 1992 show that significant quantities of polychlorinated biphenyls (pcbs) and pesticides were being released into the atmosphere by the five Great Lakes
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