As regular readers will know, for a long time I’ve emphasized what are now being called tipping points, and in particular the tipping point where permafrost melt becomes self sustaining. As a matter of politics, I’ve been quite sure this would occur, since we aren’t likely to do anything about it.
It’s possible this model is wrong on the margins, but I’d be rather surprised if it’s wrong on the fundamentals. The danger has always been passing the point where humanity was in the driver’s seat. We started global warming climate change, but we can no longer stop it short of, perhaps, some hail-mary geo-engineering.

