ruiner..I don't know where you get you figures but suggest you google the issue.
Here is one site..
Atmospheric Gases Quote:
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The atmosphere of our planet contains several hundred different gases of diverse origins. However, about 99.96 percent of the total mass of the atmosphere is due to the presence of three major permanent constituents: nitrogen (N2), 78.08 percent by volume; oxygen (02), 20.95 percent by volume; and argon (Ar), 0.93 percent by volume. Water vapor (H20), an atmospheric gas with a variable concentration, ranges by volume from a small fraction of a percent up to 1 or 2 percent.
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ergo...CO2 is a trace gas and it you read up on it humans create a small percent(.04%) of that trace.