Jonathan, thanks for the reply. I am just an arm chair scientist peeking in from a distant field. but from what I have managed to glean after hours of looking at IPCC reports is that:

We have strong confidence in CO2 measures, reasonable confidence on projected temp ranges and water levels.

But not great confidence regarding the many tipping points and the consequences of these tipping points. (they are worrying, but pretty high uncertainty exists around how, when, and how big each is.

And the same for species loss. There are worrying signs, but not real definitve predictions on this, nor certainty around it.

And the same for monetary costs. There are some costs that can be pinned down with good certainty. but the dollar figures I have seen are not existential in nature.

So my summary is the the liberal left is painting this as a virtual certainty of existential consequences: e.g. millions die, eocsystem collapses, etc.

But I cannot find scientists make such predictions with certainty. Still one could argue we should act even w/o certainty. fine. but that is not what the media is telling us.

If you know of existential outcomes with high certainty I am interested to know them. (e.g not a 5C increase in temp... that is an intermediate... a final outcome is 5 trillion lost or 5 million dead or ecosystem collapse.)