Siberian Methane

Here's a bit more flesh on the bones of this summer's "methane bubbling up in the Laptev Sea" stories from Grist.  Semiletov, the boffin whose annual expedition spotted wide-scale bubbling this year that wasn't previously there, said, "I think we have to tell people that something is happening now with the subsea permafrost." 

Runaway methane emission from under the permafrost could trigger runaway warming, which is a whole bundle of glee.