Well Feanor, I don't exactly agree with the severity of your message (300' if the Arctic icecap melts away?), but I do agree with the basic premise that the observed change is exponential. Therefore I have a serious issue with the type of Bush-like right-wing stance that Obama took in Copenhagen. It does nothing to further understanding, cooperation, and the search for a solution.

Regarding climate change, I can say that in my own lifetime I have seen this. Places that I knew when I was young that then still had snow, haven't seen any in years. Likewise I used to go fishing in places that are now completely polluted and/or dried up. I'm sure we can all find examples of this phenomenon. Now if climate change is indeed exponential, that ought to be an alarming realization for us all. What we don't need is politicians acting like this is another Cuban missile crisis, because unlike the Russians, mother nature doesn't back down - she doesn't even care that we aren't quite ready to give up our comfortable way of life.