The transfer of carbon among the various reservoirs of the Earth both influences the global climate and makes possible life itself. The relative size of the major carbon reservoirs is shown in Figure 2.1. The atmosphere is a relatively small carbon reservoir. In pre-industrial times it contained roughly 600 gigatons of carbon, C. This has increased to approximately 900 gigatons of carbon since that time. These masses of carbon are equivalent to 2,200 and 3,300 gigatons of carbon dioxide, CO2, respectively. Note that some literature sources, including this one, refer at times to masses of C and...
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