It's irrelevant. CO2 was a trace gas and it still is a trace gas. In the last 150 years it has gone from about 3 parts per 10,000 to 4 parts per 10,000.Quote from futurecurrents:
The fact is that CO2 levels have gone up 40% in the last 150 years due to man.
CO2 is insignificant as the MIT atmospheric scientist says:
âThe influence of mankind on climate is trivially true and numerically insignificant.â
~Richard Lindzen, MIT Atmospheric Physicist
Now let that sink in and let who said it sink in.