The fossil components are naturally inert. The stock of fossil organic carbon and mineral carbonates (estimated at 65.5 x 106 PgC) is relatively constant and would not dramatically change within a century. The lithospheric part of the carbon cycle is very slow; all the fluxes are less than 1 PgC yr~ . For example, volcanic emissions are
estimated at 0.15-0.25 PgC yr-1. Therefore, the turnover time of the storage amounts to millions or hundred millions of years.
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