 
                        
                                 In this aerial image, thermokarst lakes are seen on June 21, 2017 in Alaska, United States.
                              
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Hot summers causing arctic sinkholes as permafrost thaws rapidly: study
Arctic sinkholes are appearing across the Canadian High Arctic as permafrost -- ice expected to be frozen year-round -- thaws and collapses due to climate change, according to research published Monday.
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                                                                                 Sue Mitchell, University of Alaska Fairbanks Geophysical Institute, 907-474-5823, sue.mitchell@alaska.edu

 
 
 
 
 
 
                                 