Thanks for a very interesting and balanced post. With all the politics surrounding this issue, it's far too easy to get caught up in the question of who's side you're on rather than looking strictly at the science.

One question:

Not to save the world (that would be rather arrogant and pretentious), but perhaps to save humanity.

Given our successful habitation of practically every land environment, I have to ask if the climate change we are experiencing/inducing really a threat to (all of) humanity?