Two factors suggest that Professor Kellett's work will be more valuable than previous efforts: he has a healthy skepticism as to the accuracy of such models and the model produces plausible prices for carbon (US$22.90 to US$65.10 tonnes of carbon dioxide).
There is a paper:
Weller, S. R., Hafeez, S., & Kellett, C. M. (2015). Estimates of the social cost of carbon using climate models derived from the CMIP3 ensemble. Retrieved from https://www.researchgate.net/profile/Steven_Weller/publication/274392763_Estimates_of_the_social_cost_of_carbon_using_climate_models_derived_from_the_CMIP3_ensemble/links/55656c2a08aec4b0f4859bcf.pdf