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Earth Day is on the horizon. But is 'greener' always better?
View a photo gallery of algae blooms in lakes.
Credit: NSF
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A toxic algae bloom, one of many around the world, covers North Carolina's Cape Fear River.
Credit: Stephanie Garrett, NCDENR
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China's Lake Taihu shows an extensive algae bloom that reaches the lake's shores.
Credit: Hans Paerl
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Researchers travel by boat through Lake Taihu's thick algae scum.
Credit: Hans Paerl
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Scientist Hans Paerl collects samples of the algae bloom in Lake Taihu.
Credit: UNC-CH Institute of Marine Sciences
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Satellite view of a widespread algae bloom in September 2013 in Lake Erie.
Credit: NASA
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