[ctrl-j]

Neither is my car, but something has to happen to make it move.

You addressed none of my questions. What, in your opinion, is the trigger for the shift?

Edit: You edited in the part about permafrost. I did some quick googling because I had never heard of the causal link of gas cavities causing the melt. I've only seen the papers on the melt causing gas to escape which then exposes underground cavities... Still can't find any sources on cavities causing surface temperature to rise - care to share some sources? That sounds interesting!