Algae blooms on rural lakes—some of which are toxic to humans and wildlife&mash;increase along with fertilizer and manure pond runoff from farms. Minnesotan Mary Taffe took this ironically beautiful image of algae on Big Stone Lake. You can see more of her photos in a Treehugger gallery.
Maggie Koerth-Baker is the science editor at BoingBoing.net. From August 2014-May 2015, she will be a Nieman-Berkman Fellow at Harvard University. You can follow Maggie's adventures in the Ivory Tower by subscribing to The Fellowship of Three Things newsletter.
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