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Determining the Social Cost of Carbon: Under Damage and Climate Sensitivity Uncertainty

Samuel Okullo ()

Environmental & Resource Economics, 2020, vol. 75, issue 1, No 4, 79-103

Abstract: Abstract This article quantifies the impact on optimal climate policy, of both damage elasticity and equilibrium climate sensitivity uncertainty, under separable preferences for risk and intergenerational inequality. The primary findings are as follows. (1) Such preferences can depress the social cost of carbon (SCC) when calibration aims at matching actual economic outcomes, countering the prevailing view that the SCC is greater with separable than with conventional entangled preferences. (2) Damage elasticity uncertainty has larger effects on climate policy than equilibrium climate sensitivity uncertainty, even under high impact tail risk of the latter. (3) Risk aversion decisively strengthens optimal climate policy under joint damage and climate sensitivity uncertainty, than with a single source of uncertainty alone. Indeed, failing to account for the interaction between damage and climate sensitivity uncertainty underestimates the cost of climate change by more than US dollars 1 trillion.

Keywords: Social cost of carbon (SCC); Epstein–Zin–Weil preferences; DICE; Climate change; Risk aversion (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s10640-019-00389-w

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