For years liberals and some "scientists" have been pushing this global warming bullshit in order to achieve our goals of... actually, shit, I've never been quite sure why we've been doing it, but we have. But what if Al Gore really is fat?
Joking aside, to me the time frame is important. Something "bad" over the next 100 years is something that can be adjusted to, some sudden radical change, like the Gulf Stream switching directions overnight, could be be absolutely catastrophic... and everything in between... the cost will be inbetween.
Not a lot of smarts in this post. I guess the point I'm making is that I've never quite had a good sense of the probability distribution of likely outcomes, from bad to totally fucking bad, even if the basic "world's getting hotter" story is true.