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The Incentives to Participate in, and the Stability of, International Climate Coalitions: A Game-theoretic Analysis Using the Witch Model

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Author Info

  • Valentina Bosetti

    (Princeton University, FEEM and CMCC)

  • Carlo Carraro

    (University of Venice, FEEM, CEPR, CESifo and CMCC)

  • Enrica De Cian

    (FEEM)

  • Romain Duval

    (OECD)

  • Emanuele Massetti

    (FEEM and CMCC)

  • Massimo Tavoni

    (Princeton University, FEEM and CMCC)

Abstract

This paper uses WITCH, an integrated assessment model with a game-theoretic structure, to explore the prospects for, and the stability of broad coalitions to achieve ambitious climate change mitigation action. Only coalitions including all large emitting regions are found to be technically able to meet a concentration stabilisation target below 550 ppm CO2eq by 2100. Once the free-riding incentives of non-participants are taken into account, only a “grand coalition” including virtually all regions can be successful. This grand coalition is profitable as a whole, implying that all countries can gain from participation provided appropriate transfers are made across them. However, neither the grand coalition nor smaller but still environmentally significant coalitions appear to be stable. This is because the collective welfare surplus from cooperation is not found to be large enough for transfers to offset the free-riding incentives of all countries simultaneously. Some factors omitted from the analysis, which might improve coalition stability, include the co-benefits from mitigation action, the costless removal of fossil fuel subsidies, as well as alternative assumptions regarding countries’ bargaining behaviour.

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Bibliographic Info

Paper provided by Fondazione Eni Enrico Mattei in its series Working Papers with number 2009.64.

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Date of creation: Aug 2009
Date of revision:
Handle: RePEc:fem:femwpa:2009.64

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Keywords: Climate Policy; Climate Coalition; Game Theory; Free Riding;

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References

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Citations

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Cited by:
  1. Carlo Carraro & Francesco Bosello & Enrica De Cian, 2009. "An Analysis of Adaptation as a Response to Climate Change," Working Papers 2009_26, Department of Economics, University of Venice "Ca' Foscari".
  2. Carlo Carraro, 2009. "The Road to Copenhagen: What Agreement Can Actually Be Effective and Stable? by Carlo Carraro," CESifo Forum, Ifo Institute for Economic Research at the University of Munich, vol. 10(3), pages 30-36, October.
  3. Fabio Sferra & Massimo Tavoni, 2013. "Endogenous Participation in a Partial Climate Agreement with Open Entry: A Numerical Assessment," Working Papers 2013.60, Fondazione Eni Enrico Mattei.

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