Temperature rises are one of the greatest threats to archaeological sites that have been frozen in permafrost for millennia.  As the permafrost melts, dormant bacteria become active and start slowly eating away organic deposits.  In this case, the remains come from three cultures in Greenland, The Saqqaq, Dorset and Thule peoples.  The Dorset play an important role in PEOPLE OF THE SONGTRAIL.  They are Asson’s people. 

http://sciencenordic.com/climate-change-destroying-greenland’s-earliest-history