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Scientists recently visited 75 crystal clear waterways in Alaska that had all turned orange. By taking samples, they were able to find a reason why.

Some of Alaska's clear, icy blue waterways are turning a startling rust orange - so intense it's visible from Earth's orbit. "The stained rivers are so big we can see them from space," says University of California (UC) Davis environmental...

Dozens of rivers and streams in the US state of Alaska are turning rusty orange. Scientists believe that permafrost, or frozen land, is what is causing the hue change. They claim that when the environment warmed, minerals kept in permafrost were released into glistening, clean water. Researchers are also concerned, as this change could threaten fisheries and drinking water quality

Alaska's melting permafrost is dumping toxic metals into the state's rivers, turning them bright orange and making the water highly acidic. The contaminated rivers are so vibrant they can be seen from space, and the problem is likely to get much worse in the future.

Thawing permafrost may be driving degradation