All values in billion tonnes of carbon per year (GtC/yr), for the globe. For values in billion tonnes of carbon dioxide per year (GtCO2/yr), multiply the numbers below by 3.664.
1 billion tonnes C = 1 petagram of carbon (10^15 gC) = 1 gigatonne C = 3.664 billion tonnes of CO2
The terrestrial sink (uncertainty of ±0.9 GtC/yr on average) is estimated from the average of several Dynamic Global Vegetation Models (DGVMs) that reproduce the observed mean total land uptake of the 1990s.
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