Campiglio, Emanuele, Dietz, Simon 
ORCID: 0000-0001-5002-018X and Venmans, Frank ORCID: 0000-0002-4264-6606
(2022)
Optimal climate policy as if the transition matters.
Grantham Research Institute on Climate Change and the Environment Working Papers (387).
Grantham Research Institute on Climate Change and the Environment, London School of Economics and Political Science, London, UK.
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Abstract
The optimal transition to a low-carbon economy must account for adjustment costs in switching from dirty to clean capital, technological progress, and economic and climatic shocks. We study the low-carbon transition using a dynamic stochastic general equilibrium model with emissions abatement costs calibrated on a large energy modelling database, solved with recursive methods. We show how capital inertia puts upward pressure on emissions and temperatures in the short run, but that nonetheless it is optimal to actively disinvest from – to ‘strand’ – a significant share of the dirty capital stock. Conversely, clean technological progress, as well as uncertainty about climatic and economic factors, lead to lower emissions and temperatures in the long run. Putting these factors together, we estimate a net premium of 33% on the optimal carbon price today relative to a ‘straw man’ model with perfect capital mobility, fixed abatement costs and no uncertainty.
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