David I like your more specific views of the possible future.
I also doubt if everything will die, in the past extinctions something survived hopefully this will remain the case.
I use the term uninhabitable loosely I admit and really seek to describe a possible situation where it is too hot for vegetation to survive.
I believe the planet has endured hotter times and life survived .. How hot can we go?
Well there are various levels from bad to worse but no doubt there is a level which could see a situation where wild life, animals and plants, no longer exists and we live underground or in cities under domes so as to create localised acceptable conditions for humans, animals and plants. I don't know what the future holds but certainly there is a point where by todays measure the planet could be described as uninhabitable.
If we extrapolate the trend the data suggests to those interpreting it we can suggest the future may see the planet so hot life will be markedly different to what we consider the norm today.
How high can temps go? We don't know really but to model a scenario of absolute disaster would not be difficult I suspect.
I believe, unscientific approach but not unrealistic, that we are powerless to change the future. Everyone will have answers but nothing will be done..goodness we can't solve so many smaller problems ..drugs war religious intolerance, so to presume the whole world can magically sit down and formulate a plan to me is simply nonsense..However governments will tax the problem and corporations will profit from this fix or that but really nothing will change..Some think that we are even now powerless to stop anything and who knows if that view is realistic or not.
So I say do nothing other than prepare for the worste case outcome stop arguing about energy pollution etc and get thinking about living in a world different to today...
Maybe consider that populations may have to relocate before the bands of displaced people demand recognition at fun point..Envisage a world where Vennis is for subs diving and Greenland is the new food bowl.
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