Ohio — Lake Erie, the smallest of North America's five Great Lakes, supplies fresh drinking water to an estimated 11 million people in Ohio, Michigan and southern Ontario province, Canada. Yet sometimes pollution, both from industrial waste and farm-chemical runoff, leaves large areas of the lake covered in half-meter-thick layers of green slime. Scientists blame the excess phosphorus and nitrates entering the water, which act like fertilizer, for Lake Erie's algal blooms. Source of the ...
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