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CO2 provides approximately .03% of the earth's atmosphere. If you consider that the earth's atmosphere contains approximately 4.2 billion cubic kilometers - which is the "effective mass" of the atmosphere, or the mass of the entire atmosphere if measured at sea level pressure - then:

4.2 billion x .03 % = 1,260,000 cubic kilometers of CO2.

The other constant used in this equation is the "Karman Limit" of 100 miles as the upper boundary for earth's atmosphere.

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