Have to say to convince me fully we would need to find answers to the "trigger points" of past warm ups and cool downs, and completely discount them from happening now. As I find our lack of knowledge in this area shocking considering the current media frenzy which is AGW, its unacceptable that it is almost a dirty thought to be hidden away and not thought about, strikes me as bizarre? I would think study the hell out of previous GW events in the past to find out more about this one would make a bit of sense........ Also to explain why the warming started so late when we were polluting long before the current warm up, and to explain why Co2 levels follow temp rise.