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The figure below gives a visual summary of the natural carbon uptake, and fossil fuel emissions, of a number of key regions in the world. These numbers are reported in teragrams of carbon per year (TgC/yr) and averaged over the decade 2001-2013. Negative numbers (green and yellow colors) indicate natural carbon uptake, while positive numbers (gold-orange colors) indicate net carbon release by the terrestrial biosphere. For example, the North American terrestrial biosphere has taken up 413 TgC/yr, and released 1697 TgC/yr from fossil fuel burning.