Tipping points are back?

Risk of multiple tipping points should be triggering urgent action on climate change

My impression is that concern about climate change tipping points has been out of fashion in the IPCC  for some years, and that those who have been worried about things being worse than they seem (such as Hansen with his papers) have been rather pooh-poohed by others.

But they are still possible, and still worth considering, even if I am again dubious about the attempt to economically value them.