Arctic rivers are undergoing significant changes due to a warming climate, with increased precipitation and permafrost thaw leading to stronger flows and altered chemical compositions.

Beavers are transforming Alaska's Arctic tundra, creating both challenges for local communities and ecological opportunities, as their population and dam-building activities alter landscapes and affect permafrost.

If carbon emissions continue at current rates, so much mercury will leach from thawing permafrost that fish in the Yukon River could become dangerous to eat within a few decades.

Recent discoloration of 75 streams in Arctic Alaska reflects increased iron and trace metal loading following climate-driven permafrost thaw. These findings have considerable implications for drinking water supplies and subsistence fisheries.

A previously unknown source of the strong greenhouse gas nitrous oxide has been found in East Siberian Yedoma permafrost. Published in Nature Communications today, the observation was made by an international group of researchers, with the lead of researchers from the University of Eastern Finland.