The world’s permafrost is getting warmer, with temperatures increasing by an average of 0.3C (0.54F) over a decade, according to scientists.
The study found the biggest rise in Siberia, where frozen soil temperatures rose by 0.9C (1.62F) between 2007 and 2016.
The temperature rose at 71 sites, sank at 12 and remained unchanged at 40.
Scientists say the increases track global warming generally.
They said thawing permafrost – already recorded at five of the sites – contains organic matter that can release greenhouse gases, further stoking climate change.
