You didn't answer my question. If CO2 is greenhouse gas than manmade globla warming must be true. It's that simple. Have you disproven the greenhouse gas properties of CO2?
No its not that simple. Its a climate system that is dynamic with all kinds of positive and negative feedback loops. It is a complex If it were that simple how come all the climate models are WRONG?
Second, it has been proven through ice core samples that increases in CO2 LAGGED increases in temp. Do you understand what that statement implies?