Actually, I'm pretty sure places like Greenland, Canada, Russia etc. will be mostly positively affected. I'm mostly concerned about the changes to the ocean when it comes to affecting all humans. The unfortunate reality is that unchecked global warming will probably lower food prices and increase standards of living in many places that are already rich, while causing destruction in places that are already relatively poor.
> alarm bells ringing about the climate...
The third option you left out is that the alarm is overinflated. With an issue as controversial as climate change, you can be almost certain that both the alarmists and skeptics are both wrong, and the truth is probably somewhere in the middle.
Also, I really don't think the end of the world is a realistic result of climate change. If you really want something to worry about, there are always meteors, gamma rays and the potential for nuclear war, superbugs, or biological WOMD.
Sane governmental response is a fantastic assumption. The orange baboon, along with present counterparts in Russia, Brazil, India, China, Turkey, Indonesia, Hungary are just a hint at what is to come.
First, why do you assume they would migrate north and not further south?
In your model do you expect people to move in or out of Australia, South Africa, Chile, etc. ?
I agree. I intended that to be implied as a possibility for the first option. Bad things will most likely happen, but it's unlikely that it's THAT bad.
I'd go as far as arguing that _everyone_ should prepare for what's coming. All of us will be affected, be it directly or indirectly, through things like the (most likely) inevitable refugee crisis, or increased food prices and lower standards of living.
> but civilization itself has never, in history, collapsed
I meant individual civilizations and not civilization itself, although I read the original comment as something happening to "our" civilization and not all of them. Total collapse of civilization itself would require something cataclysmic happening on a global scale, and that the effects of said event are so severe that all of humanity fail to restore itself within the time span of several generations.
Some of the more alarmist reports about global warming are indeed pointing at that scenario, although it's more likely that progress will be slower, and that humanity as a whole will be able to adapt in the long run.
Regardless, I am convinced that even if we were talking about the actual end of civilization itself, it would not necessarily be evident to us until it was too late.
The fact that there are alarm bells ringing about the climate now is an indicator of climate changes being either:
a) survivable for humanity as a whole by doing what we can to prevent it and prepare for what happens if we fail
b) the end of the world and it's too late to do anything
This turned darker than I planned. :D