What's behind Lake Erie's algae explosion

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http://i.cbc.ca/1.2729377.1407354477!/cpImage/httpImage/image.jpg_gen/derivatives/16x9_460/toledo-water-problems.jpg Huge blooms of toxic blue-green algae fouling Lake Erie recently threatened the drinking water of 400,000 people, decades after the problem was thought to be solved. Here's what scientists think is going on this time, and how it can be fixed.


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