Yellowstone National Park’s geothermal springs used to be blue — until tourists started tossing trash in them

December 22, 2014 4:33 PM

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The debris thrown into the pools block the magma vents that heat them, lowering the temperature and allowing microbes to thrive.

Those brilliant hues of yellow and orange and green you see when you visit the geothermal pools of Yellowstone National Park didn’t always look that way.

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