center for naf val analysis. instead of the marvelous mark sitting next to you, say you had the koch brothers and u.s. climate skeptic, what would you say to those people to envoc their self interest and commitment to climate change? >> i try on this particular issue to say the same thing to everybody. what i start with is that you really got look at the science. and the science is pretty astounding. and the science is one that you really have tomorrow brace it. and then after the science, i would invite them to travel with me. to places that have been impacted. so i would invite them to visit for example, where i visited just a while ago. then i put it in the same way that david cameron has put it. what he said is, is look, the science is pretty convincing to me. but even if you don't think that this is real, and you think that chances of the terrible events that we predict are not real, even if you think this is 10% chance that this is real, wouldn't you buy insurance against it? isn't that what we do with insu