Global warming of +10C is ====>!!NOT!!<==== a reasonable expectation (erratum et apologia)

[GliderGuider]

10. Thanks, those are good additions.

For me much of the uncertainty lies in how fast the heating follows the CO2 rise, how the instability manifests itself and of course how we respond - first as nations, then as a global civilization as things begin to come apart. As long as this globalized, industrialized culture remains intact I share your pessimism about the probability of cooperative, altruistic action.

I personally think we have few options left any more for dealing with this - we seem to have +4 baked in the cake at this point, and the effects of rising temperature seem so far to be worse than we expected, as you point out. If we don't lose the fight around mid-century, I think we'll probably just lose it more deeply and surely later on.

I'm now pretty much convinced of the possibility of the extinction (or virtual extinction) of our species some time next century, as the planet finally turns inhospitable to us. The time between now and then will be filled with intensifying foreshocks of that existential earthquake.