Extreme flooding on Alaska's Arctic highway in 2015 caused thaw-induced sinking in the permafrost terrain up to 3 inches deep, with the most significant effects occurring in ice-rich areas, according to a newly published study.

Rising Arctic temperatures are causing permafrost to thaw, putting the world’s largest city built on frozen ground in deep trouble.

This year was one of the warmest and wettest in recorded history, and permafrost thaw is causing the ground at the mass gravesite to sink.

In villages like Kongiganak, communities have stopped burying their dead because, as the permafrost melts, the oldest part of their cemetery is sinking.

Government scientists have found an island in the Beaufort Sea that is shedding as much as 40 metres of ground each summer.

Because ice makes up a good portion of the underground foundation of northern Alaska, thawing has dropped the landscape as much as 3 feet in some places.

Alaska’s tundra landscapes carpet a good portion of the state, from the North Slope to the elbow of the Alaska Peninsula. Researchers say it's slowly sinking in places -- as much as a fifth of an inch each year.