A three-year study of humans' cumulative effects on the Great Lakes has concluded that Lakes Erie and Ontario face the greatest threats while Lake Superior faces the least. The study showed that multiple threats, including an invasive mussel species and human waste buildup, combined to endanger the lakes. "It's almost a death-by-a-thousand-cuts syndrome," said University of Wisconsin-Madison limnologist Peter McIntyre. The study was published Monday in the journal Proceedings of the National Academy of Sciences.
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