And again, the IPCC has duped you. Do you have any idea how many studies have dealt with that particular issue? Here is a chart listing the 37 most prominent. Actually, I should say 36 because one of them wasn't based on a study at all.
Of the 37 listed, 2 suggest more than 20 years. 6 suggest more than 10 years but less than 15. 30 suggest less than 10 years. The UN suggests 100 years. Upon what basis do you suppose they make that claim and why?

Face it guy, you have been duped. An international agency with an agenda has taken advantage of your trust. They have lied to you, fabricated science, and fabricated a scientific consensus. If I were you, I would be pissed. Why are you not pissed? Do you still believe that the residence time of a CO2 molecule in the atmosphere is 100 years? If you are convinced that it is not, how does that alter your beliefs with regard to manmade CO2 and the amount of it that is in the atmosphere at any given time?

Actually the natural carbon cycle has released far more than 6 billion tons of CO2. Our 6 billion tons is a fraction of 1 percent of the natural carbon cycle. Once more with emphasis.... MAN'S CONTRIBUTION TO ATMOSPHERIC CO2 IS NOT ENOUGH TO OVERCOME THE NATURAL DEVIATION FROM YEAR TO YEAR IN THE EARTH'S OWN NATURAL CO2 MAKING MACHINERY.
Considering that a CO2 molecule doesn't hang around for anything like the hundred years you thought, I think maybe you should take some time, do a bit of research and find out for yourself. I can account for much of it but it is clear by now that you won't accept anything I tell you anyway.