Your premise is that warmer is bad.
Your premise not based on science at all.
Science is nietiher good not bad, it is science.
No value judgements have a place in science.
YES, it might be getting warmer, but NO it is neither good not bad.
Is just is.
"What is is?"
-------Billy-boy Clinton as he zipped up his pants.
You have no clue what higher life forms might come to be at +8?
OR +12?
You assume man is the top of the evolutionary ladder but can you prove it?
Maybe Man evolves into a stronger version, not as vulnerable to the elements, one who could continue evolution to other planets better that our current bodies could do.
Maybe dolphins are sitting on the cusp of ruling the world, just need a couple more degrees of fresh glacier water to seal the deal.
They have already started to train US!