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Uncertainty in Integrated Assessment Modelling: Can Global Sensitivity Analysis Be of Help?

Author

Listed:
  • Barry Anderson
  • Emanuele Borgonovo
  • Marzio Galeotti
  • Roberto Roson

Abstract

The complexity of integrated assessment models (IAMs) prevents the direct appreciation of the impact of uncertainty on the model predictions. However, for a full understanding and corroboration of model results, analysts might be willing, and ought to identify the model inputs that influence the model results the most (key drivers), the direction of change associated with the variation of a given input and the overall model structure (interaction analysis). We show that such information is already contained in the data set produced by Monte Carlo simulations commonly used in IAM studies and that can be extracted from it without additional calculations. Our discussion is guided by an application of the proposed methodologies to the well-known DICE model of William Nordhaus (2008). A comparison of the proposed methodology to approaches previously applied on the same model shows that robust insights concerning the dependence of future atmospheric temperature, global emissions and current carbon costs and taxes on the model's exogenous inputs can be obtained. The method avoids the fallacy of a priori deeming the important factors based on the sole intuition

Suggested Citation

  • Barry Anderson & Emanuele Borgonovo & Marzio Galeotti & Roberto Roson, 2012. "Uncertainty in Integrated Assessment Modelling: Can Global Sensitivity Analysis Be of Help?," IEFE Working Papers 52, IEFE, Center for Research on Energy and Environmental Economics and Policy, Universita' Bocconi, Milano, Italy.
  • Handle: RePEc:bcu:iefewp:iefewp52
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    Keywords

    Uncertainty; integrated assessment model; climate change; global sensitivity analysis;

    JEL classification:

    • H21 - Public Economics - - Taxation, Subsidies, and Revenue - - - Efficiency; Optimal Taxation
    • H23 - Public Economics - - Taxation, Subsidies, and Revenue - - - Externalities; Redistributive Effects; Environmental Taxes and Subsidies
    • H87 - Public Economics - - Miscellaneous Issues - - - International Fiscal Issues; International Public Goods
    • O44 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Environment and Growth
    • O13 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Agriculture; Natural Resources; Environment; Other Primary Products
    • Q5 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics
    • Q54 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Climate; Natural Disasters and their Management; Global Warming

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