Ant,
I don’t know that science can tell us anything about the qualitative aspects. In some ways I think that even trying to quantify the future effects can be misguided.
let’s say I come down on the side of common sense. Basic physics tells us that changing the atmosphere will change the climate, over time.
That argues for two things.
1. find pathways to curtail that activity
2. build societies that are resilient to climate change.
I think people have jumped to solutions far too quickly without getting agreement on broad principles. FWIW.