According to the National Center for Atmospheric Research, "The total mean mass of the atmosphere is 5.1480×10^18 kg with an annual range due to water vapor of 1.2 or 1.5×1015 kg depending on whether surface pressure or water vapor data are used"
Currently, the CO2 concentration 383 ppm (or 0.0383%), so the amount of CO2 is 1.9717X10^15 kg.
From CARMA and the center for global development.
The world produces about 8315 metric tons of CO2 each year (8.315X10^12 kg). That will come out to an increase of CO2 of 0.422% (or an increase of 1.615 ppm per year). But, "Nearly 50% of the carbon dioxide that humans have pumped into the atmosphere over the last 200 years has been absorbed by the sea, scientists say." So each year we increase the CO2 ppm by about 0.8 ppm per year (at todays levels, in days past we produced even less).
Now if we look at the current trend of CO2 increases, we will find that it is growing much faster than man is producing (sources go from 1.5 ppm per year to 2 ppm per year). Now the math shows that mankind is not polluting that much to cause that kind of increase.
Earth's atmosphere - Wikipedia, the free encyclopedia
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The Heat Is Online
Carbon Dioxide Rate is at Highest Level for 650,000 Years
There's my arguement.