Natural storage of Carbon, sources and sinks of the Earth’s Carbon cycle

Natural CO2 store (limestone, CaCO3)

Natural CO2 store (limestone, CaCO3)

Worldwide distribution of Carbon
Example of a natural source of CO2

Example of a natural source of CO2

                                                                    

Sources and Sinks of CO2
Worldwide Carbon Stocks and Fluxes
(in petagram (Pg) of Carbon: 1 Pg =1015 grams or = 1 Gt)
Source: IPCC

Carbon cycle