Figure 3.

Annual global fossil emissions of CO₂. Emissions from 1990 to 1999 as a result of fossil fuel burning and cement production are shown by circles. Deduced global fossil CO₂ emissions that lead to the concentration pathways toward stable CO₂ concentrations ranging from 450 to 1,000 ppm given in Fig. 2 are shown by the labeled solid curves. Six SRES emission scenarios are shown by the curves with symbols. In addition to global SRES emissions, the emissions from non-Annex 1 countries are similarly shown, starting from the 1999 annual emissions of 2.7 Gt C.