Alaska's rivers are turning bright orange, and scientists are working to figure out exactly why. In recent years, scientists have observed streams and rivers that have turned a vibrant orange color ...

(CNN) — 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. The finding ...

Across Arctic Alaska, once-clear rivers are shifting to a startling rust color, a visible scar of a warming climate etched into the landscape. What looks like a strange natural dye job is in fact a ...

In Alaska’s far north, something strange is happening. Rivers that once ran crystal clear are now turning a rusty orange, and scientists say the shift is permanent. A new study published in The ...

Permafrost sounds permanent, but there’s a catch: the top portion, called the active layer, freezes and thaws every year. In ...

In recent years, the typical purples, blues and greens that color Alaska’s tundra ecosystems have been cut through with an unexpected hue as rivers run orange. The phenomenon was first widely noted by ...

It was a cloudy July afternoon in Alaska's Kobuk Valley National Park, part of the biggest stretch of protected wilderness in the U.S. We were 95 kilometers (60 miles) from the nearest village and 400 ...