I like this discussions but before we enter into them we must understand the issues without the political baggage. With climate change the science got politicized before it was even close to understood. So now we have hardened positions and climate models that can show what it happening today — so how can be believe that can can show what might be even a few decades off. Since the key to all of this is the forcing values of CO2 it would seem to me that that must be understood fully first before any other issue.