Risk aversion, time preference, and the social cost of carbon

The Stern Review reported a social cost of carbon of over 300/tC, calling for ambitious climate policy. We here conduct a systematic sensitivity analysis of this result on two crucial parameters: the rate of pure time preference, and the rate of risk aversion. We show that the social cost of carbon lies anywhere in between 0 and 120 000/tC. However, if we restrict these two parameters to matching observed behaviour, an expected social cost of carbon of 60/tC results. If we correct this estimate for income differences across the world, the social cost of carbon rises to over 200/tC. © 2009 IOP Publishing Ltd.