IPCC Fourth Assessment Report: Climate Change 2007
Climate Change 2007: Synthesis Report

Illustrative mitigation portfolios for achieving stabilisation of GHG concentrations

Figure 5.2

Figure 5.2 Cumulative emissions reductions for alternative mitigation measures for 2000-2030 (left-hand panel) and for 2000-2100 (right-hand panel). The figure shows illustrative scenarios from four models (AIM, IMAGE, IPAC and MESSAGE) aiming at the stabilisation at low (490 to 540ppm CO2-eq) and intermediate levels (650ppm CO2-eq) respectively. Dark bars denote reductions for a target of 650ppm CO2-eq and light bars denote the additional reductions to achieve 490 to 540ppm CO2-eq. Note that some models do not consider mitigation through forest sink enhancement (AIM and IPAC) or CCS (AIM) and that the share of low-carbon energy options in total energy supply is also determined by inclusion of these options in the baseline. CCS includes CO2 capture and storage from biomass. Forest sinks include reducing emissions from deforestation. The figure shows emissions reductions from baseline scenarios with cumulative emissions between 6000 to 7000 GtCO2-eq (2000-2100). {WGIII Figure SPM.9}