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28 - What is the economic value of information about climate thresholds?
- from Part IV - Policy design and decisionmaking under uncertainty
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- By Klaus Keller, 208 Deike Building Department of Geosciences The Pennsylvania State University University Park, PA 16802, USA, Seung-Rae Kim, Woodrow Wilson School and Department of Economics Princeton University Princeton, NJ 08544, USA, Johanna Baehr, 208 Deike Building Department of Geosciences The Pennsylvania State University University Park, PA 16802, USA, David F. Bradford, 208 Deike Building Department of Geosciences The Pennsylvania State University University Park, PA 16802, USA, Michael Oppenheimer, Department of Geosciences Princeton University Princeton, NJ 08544, USA
- Edited by Michael E. Schlesinger, University of Illinois, Urbana-Champaign, Haroon S. Kheshgi, Joel Smith, Francisco C. de la Chesnaye, John M. Reilly, Massachusetts Institute of Technology, Tom Wilson, Charles Kolstad, University of California, Santa Barbara
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- Book:
- Human-Induced Climate Change
- Published online:
- 06 December 2010
- Print publication:
- 11 October 2007, pp 343-354
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- Chapter
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Summary
Introduction
The field of integrated assessment of climate change is undergoing a paradigm shift towards the analysis of potentially abrupt and irreversible climate changes (Alley et al., 2003; Keller et al., 2007). Early integrated studies broke important new ground in exploring the relationship between the costs and benefits of reducing carbon dioxide (CO2) emissions (e.g., Nordhaus, 1991; Manne and Richels, 1991; or Tol, 1997). These studies project the climate response to anthropogenic CO2 emissions to be relatively smooth and typically conclude that the projected benefits of reducing CO2 emissions would justify only small reductions in CO2 emissions in a cost–benefit framework. The validity of the often- assumed smooth climate response is, however, questionable, given how the climate system has responded to forcing in the geological past. Before the Anthropocene, the geological time period where humans have started to influence the global biogeochemical cycles considerably (Crutzen, 2002), the predominant responses of the climate system were forced by small changes in solar insolation occurring on timescales of thousands of years (Berger and Loutre, 1991). Yet this slow and smooth forcing apparently triggered abrupt climate changes – a threshold response where the climate system moved between different basins of attraction (Berger, 1990; Clement et al., 2001). Anthropogenic forcing may trigger climate threshold responses in the future (Alley et al., 2003; Keller et al., 2007).