I think the RISKS associated with climate change are existential. Thus I favor spending many tens of billions in mitigation. My lightly educated opinion is that there are probably better ways to spend that money than CO2 reduction.

My primary push back is that most people believe the scientists have strong certainty regarding the big consequences (like a tipping point). We really don't understand with confidence if or where these things happen. There is evidence that they will happen agreed.

They really DON'T have such certainties at all. This is why the IPCC report is so anemic... It focused on only what is known.

I would wish for a more accurate claim: we must act now as the risks are too great to wait for high confidence.