a metaanalysis of a large number of climate models came up with a mean estimate of usd per tc for again such numbers resulting from very highlevel topdown models must be taken with great caution let it just be said that their order of magnitude is comparable to that of estimates of the social costs of carbon which supports the c objective the appropriate price of c emissions must drive a wedge between the costs of fossil fuelbased power generation and generation with lowcarbon technologies such as nuclear hydro and renewables