FEEM working papers "Note di lavoro"
1999.092

Recursive Intergenerational Utility in Global Climate Risk Modeling


Authors: Minh Ha-Duong, Nicolas Treich
JEL n.: Q20,D81,D90,H43
Keywords: Recursive utility,risk,discounting,sustainability,climate

Abstract

This paper distinguishes relative risk aversion and resistance to intertemporal substitution in climate risk modelling. Stochastic recursive preferences are introduced in a stylised numeric climate-economy model using preliminary IPPC 1998 scenarios. It shows that higher risk aversion increases the optimal carbon tax. Higher resistance to intertemporal substitution alone has the same effect as increasing the discount rate, provided that the risk is not too large. We discuss implications of these findings for the debate upon discounting and sustainability under uncertainty.

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