Steering the Climate System: Using Inertia to Lower the Cost of Policy: Comment
American Economic Review
vol. 110,
no. 4, April 2020
(pp. 1231-37)
Abstract
Lemoine and Rudik (2017) argues that it is efficient to delay reducing carbon emissions, due to supposed inertia in the climate system's response to emissions. This conclusion rests upon misunderstanding the relevant earth system modeling: there is no substantial lag between CO2 emissions and warming. Applying a representation of the earth system that captures the range of responses seen in complex earth system models invalidates the original article's implications for climate policy. The least-cost policy path that limits warming to 2°C implies that the carbon price starts high and increases at the interest rate. It cannot rely on climate inertia to delay reducing and allow greater cumulative emissions.Citation
Mattauch, Linus, H. Damon Matthews, Richard Millar, Armon Rezai, Susan Solomon, and Frank Venmans. 2020. "Steering the Climate System: Using Inertia to Lower the Cost of Policy: Comment." American Economic Review, 110 (4): 1231-37. DOI: 10.1257/aer.20190089Additional Materials
JEL Classification
- H23 Taxation and Subsidies: Externalities; Redistributive Effects; Environmental Taxes and Subsidies
- Q54 Climate; Natural Disasters and Their Management; Global Warming
- Q58 Environmental Economics: Government Policy