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Earth Day is on the horizon. But is 'greener' always better?

Collage of images showing algae in alakes and researcher

View a photo gallery of algae blooms in lakes.

Credit: NSF


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A toxic algae bloom covering North Carolina's Cape Fear River.

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, showing an extensive algae bloom that reaches the lake's shores.

China's Lake Taihu shows an extensive algae bloom that reaches the lake's shores.

Credit: Hans Paerl


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boat going through Lake Taihu's thick algae scum.

Researchers travel by boat through Lake Taihu's thick algae scum.

Credit: Hans Paerl


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Scientist Hans Paerl holding a bottle with algae in water from in Lake Taihu.

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 Lake Erie.

Satellite view of a widespread algae bloom in September 2013 in Lake Erie.

Credit: NASA


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