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1. The Economics of Inaction on Climate Change: A Sensitivity Analysis

Author:
Frank Ackerman and Ian J. Finlayson
Publication Date:
10-2006
Content Type:
Working Paper
Institution:
Global Development and Environment Institute at Tufts University
Abstract:
Economic models of climate change often take the problem seriously, but paradoxically conclude that the optimal policy is to do almost nothing about it. We explore this paradox as seen in the widely used DICE model. Three aspects of that model, involving the discount rate, the assumed benefits of moderate warming, and the treatment of the latest climate science, are sufficient to explain the timidity of the model's optimal policy recommendation. With modifications to those three points, DICE shows that the optimal policy is a much higher and rapidly rising marginal carbon price; that higher carbon price has a greater effect on physical measures of climate impacts. Our modifications exhibit nonlinear interactions; at least at low discount rates, there is synergy between individual changes to the model. At low discount rates, the inherent uncertainty about future damages looms larger in the analysis, rendering long-run economic modeling less useful.
Topic:
Climate Change, Economics, and Environment

2. Can Climate Change Save Lives? A comment on "Economy-wide estimates of the implications of climate change: Human health"

Author:
Frank Ackerman and Elizabeth Stanton
Publication Date:
09-2006
Content Type:
Working Paper
Institution:
Global Development and Environment Institute at Tufts University
Abstract:
In a recent article in this journal, Francesco Bosello, Roberto Roson, and Richard Tol make the surprising prediction that the first stages of global warming will, on balance, save a large number of lives. Bosello et al. fail to substantiate this remarkable estimate, and they make multiple mistaken or misleading assumptions. They rely on research that identifies a simple empirical relationship between temperature and mortality, but ignores the countervailing effect of human adaptation to gradual changes in average temperature. While focusing on small changes in average temperatures, they ignore the important health impacts of extreme weather events such as heat waves, droughts, floods, and hurricanes. They extrapolate this pattern far beyond the level that is apparently supported by their principal sources, and introduce an arbitrary assumption that may bias the result toward finding benefits from warming.
Topic:
Climate Change, Economics, and Environment
Political Geography:
San Francisco