The concentration of CO2 in the atmosphere was 295 PPM in 1900. It is
now about 275 PPM.
CO2 has an average lifetime of 100 - 120 years in the atmosphere.
1 PPM of CO2 in atmosphere = 2.13 Gt (billions of tons) of carbon.
375 PPM - 295 PPM = 80 PPM. 80 X 2.13 billion tons = 170.4 billion tons.
Conclusion: There are 170.4 billion more tons of CO2 in the atmosphere
now than in 1900.
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