Well, I guess it's escapable if you believe that NOAA is cooking its atmospheric temperature figures. Otherwise you have to believe that heat is passing through the troposphere at a "normal" rate and that global warming is caused by something else. Physics says that if the CO2 in the troposphere was blocking heat that the troposphere would heat up measurably. This hasn't happened according to NOAA.
As I said above I'm not trying to deny that we are experiencing a change in the global climate. I just don't necessarily buy the argument that it's due to CO2 in the atmosphere. If someone else comes up with data-driven (as opposed to theoretically modelled) proof that CO2 is doing it, I'd change my mind like a shot. But I've been reading this stuff up lately and while I started out believing that it was CO2 that was causing the change, I'm now much less than convinced.
