I'm still not sure your guys aren't concerned about the “millions of tons” of CO2 that we put up into the atmosphere each year.
Actually, the amount of C02 that we put out each year is about 0.12% of the total effective greenhouse warming gases that are generated each year. Another 0.16% are other manmade causes (mostly methane). The other 99.72% of effective greenhouse gases are natural.
But millions of tons of CO2 is so much more alarming. (Its a BIG planet folks, in spite of that photo from the moon).
As far as I know there is no such study using real data, only the use of Climate Model outputs. The assertions of Hansen would appear to be conjecture. The lamentations of AGWers would appear to be coming from visits to the oracles at Delphi.