The total mean mass of theEarth's atmosphere is 5.1×1018 kg.
Fraction of this which is CO2: 400 ppm (by volume)
Assume ideal, perfect gases, etc, etc.
Mass of CO2 in atmosphere: 2×1015 kg. (1)
Estimated (2005-06) total coal reserves: 905 GT = 9×1014 kg.
Multiply by (12/14) * (44/12) to convert hydrocarbon (CH2)n to CO2: 2.8 ×1015 kg
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