text: JC comment: The bottom line seems to be that SCC is being established as a surrogate for a National Carbon Tax. My reaction to all this is that it seems like the uncertainty in SCC is colossal, I am not convinced that we should even have confidence in the sign of the SCC in light of the SPPI and WSJ analyses. And the White House is presenting values of SCC with two significant figures? Uncertain T. Monster is not pleased. There has been no attempt to propagate uncertainty through the FUND, DICE and PAGE models, not to mention whatever front end assumptions about carbon and climate are being used as inputs.