Appendix 15a. Social Cost of Carbon for Regulatory Impact Analysis under Executive Order 12866 Table of Contents

15A.1 EXECUTIVE SUMMARY .................................................................................................1 15A.2 MONETIZING CARBON DIOXIDE EMISSIONS...........................................................2 15A.3 SOCIAL COST OF CARBON VALUES USED IN PAST REGULATORY ANALYSES.........................................................................................................................4 15A.4 APPROACH AND KEY ASSUMPTIONS ........................................................................5 15A.4.1 Integrated Assessment Models ..........................................................................5 15A.4.2 Global versus Domestic Measures of SCC......................................................11 15A.4.3 Valuing Non-CO2 Emissions ...........................................................................13 15A.4.4 Equilibrium Climate Sensitivity ......................................................................13 15A.4.5 Socio-Economic and Emissions Trajectories...................................................16 15A.4.6 Discount Rate...................................................................................................18 15A.5 REVISED SCC ESTIMATES ...........................................................................................24 15A.6 LIMITATIONS OF THE ANALYSIS ..............................................................................30 15A.7 A FURTHER DISCUSSION OF CATASTROPHIC IMPACTS AND DAMAGE FUNCTIONS .....................................................................................................................32 15A.8 CONCLUSION..................................................................................................................34 15A.9 REFERENCES ..................................................................................................................35 15A.10 APPENDIX........................................................................................................................40 15A.10.1 Other (non-CO2) gases...................................................................................41 15A.10.2 Extrapolating Emissions Projections to 2300 ................................................44