I studied geology in college so I feel like I have a comprehensive view of the temperature record that the earth has had over the last 4.6 billion years and there’s always been a lot of variation – there have been periods where we’ve had higher CO2 concentrations, and lower temperatures There are a lot of feedback mechanisms, so as the ocean changes temperature it can either hold more or less CO2. So it’s one of those things where I don’t think the jury is out. I think there’s a lot of uncertainty. … It’s not to say that we’re not having an impact on the climate, because I think we are having some impact. But how sensitive is the global atmosphere and temperature to our carbon dioxide and greenhouse gas emissions? I just don’t think they’re necessarily as big a factor as some people say they are.