Across the world, lakes, rivers, and streams are being poisoned and choked by toxic algal blooms. The most common culprit is cyanobacteria, also known as blue-green algae because of its tendency to turn previously pristine bodies of water a suspicious shade of teal. These blooms are health hazards for humans, pets, and fish, and they can take a toll on local economies that rely on revenue from tourists looking to get out on the water in the warmer months.

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