That's a very good question. In reference to the Stern report, I think the global estimate was $7 trillion. I'm not sure how that compares because I haven't really done that kind of comparison, but the numbers for the Canada country study that recognizes our ten years--we're ten years later--were based upon U.S. and EU-type estimates.
So I assume the Stern report is very consistent with that, although my sense is that as soon as you start getting into more ecosystem, quality of life issues--non-market estimates--it's very difficult to put a dollar value on that.