An orange tributary of the Kugororuk River is pictured in Alaska. Scientists are trying to find out why rivers and streams across Alaska's Arctic are turning a rusty orange color.

A new study shows that rusty discoloration in Alaska’s otherwise pristine streams and rivers is likely due to melting permafrost—and that’s a problem for Arctic animals and people.

An aerial view shows the rust-colored Kutuk River in the Arctic National Park in Alaska.

Rivers and streams in Alaska are changing color – from a clean, clear blue to a rusty orange – because of the toxic metals released by thawing permafrost, according to a new study.

Rivers and streams in remote parts of Alaska have been turning orange for years. Scientists believe they know what's behind the color change.

Rivers and streams in Alaska are turning orange and acidic. The cause may be warmer summers and melting permafrost, but scientists are still testing.

Rivers and streams in Alaska are changing color – from a clean, clear blue to a rusty orange – because of the toxic metals released by thawing permafrost, according to a new study.

Climate change is likely causing dozens of rivers in Alaska to flow orange, and it could be disastrous for the state, researchers say.

At least 75 of Alaska's waterways are turning orange in the summer, with some so acidic they're comparable to lemon or orange juice, researchers say.

Alaska’s Arctic Waterways Are Turning a Foreboding Orange The phenomenon threatens local drinking water, and scientists think climate change may be the culprit.

Rivers and streams in Alaska are changing color – from a clean, clear blue to a rusty orange – because of the toxic metals released by thawing permafrost, according to ...