I think differences between scientists on feedbacks & irreversible/runaway climate scenarios is one of the trickiest areas.
Are feedbacks factored into the IPCC models adequately?
Would 2.5°C likely trigger 3°C and so on, or is there 0 evidence for this? Tricky, tricky, tricky.
Also, how much warming is locked in and why?
Would 3°C cause total collapse or is it 4°C for end of civilisation?
It seems obvious that the more warming there is the more dangerous the world becomes politically, though not everyone agrees on that either. 'Thriving' at 2.5°C?!?
I was mulling over this from @MichaelEMann.👇
I think (or, I think I think) that it must be accepted as unknown territory despite all the scientific understanding, and that therefore 'risk' becomes the key word.
But the uncertainty & debate is unsettling.
You can follow @ClimateBen.
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