Lehman Brothers has a new-ish report out titled "The Business of Climate Change II". It includes, among other things, an estimate of the true "social" cost of carbon:

Given these studies, we currently take as a central working estimate of the 'social' cost of carbon a figure of $50 per tonne today (€40), rising to perhaps $100 per tonne by 2050.

They also say that the way uncertainty plays out in this regard, "society might want to pay an insurance premium, to reduce the risk of an unforeseeable non-linearity, discontinuity, or catastrophe" since there's some chance that the impact of large-scale warming will be much worse than current science deems likely.

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