http://www.newsweek.com/2016/06/10/permafrost-greenhouse-gases-global-warming-465585.html http://www.newsweek.com/2016/06/10/permafrost-greenhouse-gas... https

http://www.newsweek.com/2016/06/10/permafrost-greenhouse-gases-global-warming-465585.html http://www.newsweek.com/2016/06/10/permafrost-greenhouse-gas... https://en.wikipedia.org/wiki/Climate_change_feedback https://en.wikipedia.org/wiki/Climate_change_feedback 'runaway' is hard to predict, perhaps even hard to define, but we're getting a much better handle on climate change feedback mechanisms.