Addendum to Technical Support Document on Social Cost of Carbon for Regulatory Impact Analysis under Executive Order 12866

The SC-CH4 and SC-N2O estimates presented in this addendum offer a method for improving the analyses of regulatory actions that are projected to influence CH4 or N2O emissions in a manner consistent with how CO2 emission changes are valued. The estimates are presented with an acknowledgement of the limitations and uncertainties involved and with a clear understanding that they should be updated over time to reflect increasing knowledge of the science and economics of climate impacts, just as the IWG has committed to do for SC-CO2.

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