Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 3.12: Projected CO2 concentrations resulting from six SRES scenarios. The SRES scenarios represent the outcome of different assumptions about the future course of economic development, demography and technological change (see Appendix II). Panel (a) shows CO2 emissions for the selected scenarios and panels (b) and (c) show resulting CO2 concentrations as projected by two fast carbon cycle models, Bern-CC and ISAM (see Box 3.7 and Figure 3.11). The ranges represent effects of different model parametrizations and assumptions as indicated in the text and in the caption to Figure 3.11. For each model, and each scenario the reference case is shown by a black line, the upper bound (high-CO2 parametrization) is indicated by the top of the coloured area, and the lower bound (low-CO2 parametrization) by the bottom of the coloured area or (where hidden) by a dashed coloured line.

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