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A scourge of the '70s returns to Great Lakes

| Staff writer of The Christian Science Monitor
Spindly aquatic algae, once foul-smelling icons for Great Lakes pollution, are back. During the depths of the lakes' environmental troubles in the 1960s and '70s, the algae's population exploded. Vast clumps piled up on beaches, looking like untreated sewage and smelling like a pig farm.

Now, despite significantly cleaner lakes, the algae have staged a comeback in every lake but Lake Superior. In some areas, they appear to be more pervasive than before. Scientists are struggling to figure out why.   more...


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