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Incomplete Carbon Cycle
The emissions part of the Global Carbon Cycle, showing natural CO2 emissions and human CO2 emissions from burning fossil fuels. Numbers represent the flux of carbon dioxide in gigatonnes per year, adapted from Figure 7.3 in the IPCC AR4. Note that the IPCC numbers refer to carbon rather than carbon dioxide (GtC rather than GtCO2), and these differ by the ratio of the molecular weights, 44/12 = 3.67, as described here.
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