“The rapid melting of the Siberian and Canadian-Alaskan permafrost is probably the most significant event in the region. It means millions, if not billions of new methane tons will be released into the atmosphere, initiating an uncontrolled feedback mechanism."
I also recommend The Real News interview with Patrick Bond, a South African professor, who give us a concise overview of the threats posed by Arctic sea melt which is supported by another recent study, and the widespread resistance to fossil fuel production and transmission that is currently occurring across the globe.