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Long Run Projections For Climate Change Scenarios

  • Warwick McKibbin

    ()

  • David Pearce

    ()

  • Alison Stegman

    ()

The prediction of future temperature increases depends critically on the projections of future greenhouse gas emissions. Yet there is a vigorous debate about how these projections should be undertaken and how reasonable is the approach of the Special Report on Emissions Scenarios (SRES) published by the Intergovernmental Panel on Climate Change (IPCC) which forms the basis of nearly all recent analyses of the impacts of climate change. In particular there has been significant criticism by Ian Castles and David Henderson regarding the plausibility of some scenarios. This paper explores a range of methodological issues surrounding projecting greenhouse emissions over the next century. It points out that understanding future emissions, requires a framework that deals with the sources of economic growth and allows for endogenous structural change. It also explores the role of “convergence” assumptions and the debate regarding the use of purchasing power parity (PPP) measurement versus market exchange rate (MER) measurement of income differentials. Using the G-Cubed multi-country model we show that emission projections based on convergence assumptions defined in MER terms, are 40% higher by 2100 than emissions generated using a PPP comparison of income differentials between economies. This result illustrates the argument by Castles and Henderson that the use of MER convergence assumptions will likely overestimate emissions projections, taking many other issues as given. However it is not clear what this means for the SRES projections given that it might be argued that in some models in the SRES, there could be endogenous changes in technology that will offset this result. We do not have access to those models to explore this issue and can only show what this particular assumption implies in the G-Cubed model. It is also ambiguous exactly what was done in the SRES report regarding convergence assumptions in some scenarios. Either way these results do not imply that climate change is not an issue but that there is a great deal of uncertainty about future climate projections and it is very unhelpful to presume that all futures are equally likely. In order to deal with this we also propose as a better guide to policymakers a methodology that calculates probabilities for future projections rather than the approach of SRES which is based on storylines without any assessment of plausibility. It is unfortunate that some analyses of the impacts of future climate change are based on the extreme outliers from the SRES without any understanding of the probability of these outcomes. This alternative approach could be done using the economic approach proposed in the G-Cubed model as outlined in this paper, or it could be done with the existing range of SRES scenarios to better inform the debate on likely future greenhouse scenarios.

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Paper provided by Centre for Applied Macroeconomic Analysis, Crawford School of Public Policy, The Australian National University in its series CAMA Working Papers with number 2004-01.

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Length: 70 pages
Date of creation: Apr 2004
Date of revision:
Handle: RePEc:een:camaaa:2004-01
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  1. Danny Quah, 1995. "Convergence Empirics across Economies with (Some) Capital Mobility," CEP Discussion Papers dp0257, Centre for Economic Performance, LSE.
  2. Olivier Jean Blanchard & Stanley Fischer, 1989. "Lectures on Macroeconomics," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262022834, March.
  3. Sala-i-martin, X., 1995. "The Classical Approach to Convergence Analysis," Papers 734, Yale - Economic Growth Center.
  4. Robert J. Barro & Xavier Sala-i-Martin, 1991. "Convergence across States and Regions," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 22(1), pages 107-182.
  5. Andrew B. Bernard & Steven N. Durlauf, 1994. "Interpreting Tests of the Convergence Hypothesis," NBER Technical Working Papers 0159, National Bureau of Economic Research, Inc.
  6. A. B. Treadway, 1969. "On Rational Entrepreneurial Behaviour and the Demand for Investment," Review of Economic Studies, Oxford University Press, vol. 36(2), pages 227-239.
  7. Quah, Danny, 1995. "Empirics for Economic Growth and Convergence," CEPR Discussion Papers 1140, C.E.P.R. Discussion Papers.
  8. Danny Quah, 2000. "Cross Country Growth Comparison: Theory to Empirics," CEP Discussion Papers dp0442, Centre for Economic Performance, LSE.
  9. Ka Yui Leung, Charles & Quah, Danny T., 1996. "Convergence, endogenous growth, and productivity disturbances," Journal of Monetary Economics, Elsevier, vol. 38(3), pages 535-547, December.
  10. Xavier Sala-i-Martin, 2002. "15 Years of New Growth Economics: What Have We Learnt?," Working Papers Central Bank of Chile 172, Central Bank of Chile.
  11. Hill, Robert J., 2000. "Measuring substitution bias in international comparisons based on additive purchasing power parity methods," European Economic Review, Elsevier, vol. 44(1), pages 145-162, January.
  12. Maddison, Angus, 1987. "Growth and Slowdown in Advanced Capitalist Economies: Techniques of Quantitative Assessment," Journal of Economic Literature, American Economic Association, vol. 25(2), pages 649-98, June.
  13. Dowrick, Steve & Quiggin, John, 1997. "True Measures of GDP and Convergence," American Economic Review, American Economic Association, vol. 87(1), pages 41-64, March.
  14. Overman, Henry G & Puga, Diego, 1999. "Unemployment Clusters Across European Regions and Countries," CEPR Discussion Papers 2255, C.E.P.R. Discussion Papers.
  15. Diewert, W E, 1992. "The Measurement of Productivity," Bulletin of Economic Research, Wiley Blackwell, vol. 44(3), pages 163-98, July.
  16. Maurice Obstfeld & Kenneth S. Rogoff, 1996. "Foundations of International Macroeconomics," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262150476, March.
  17. Quah, Danny, 1997. "Empirics for Growth and Distribution: Stratification, Polarization, and Convergence Clubs," CEPR Discussion Papers 1586, C.E.P.R. Discussion Papers.
  18. Bernard, Andrew B & Durlauf, Steven N, 1995. "Convergence in International Output," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 10(2), pages 97-108, April-Jun.
  19. Sala-i-Martin, Xavier X., 1996. "Regional cohesion: Evidence and theories of regional growth and convergence," European Economic Review, Elsevier, vol. 40(6), pages 1325-1352, June.
  20. Hill, Robert J., 2003. "Constructing price indexes across space and time: the case of the European Union," GGDC Research Memorandum 200362, Groningen Growth and Development Centre, University of Groningen.
  21. Arnulf Grübler & Nebojsa Nakicenovic & Joe Alcamo & Ged Davis & Joergen Fenhann & Bill Hare & Shunsuke Mori & Bill Pepper & Hugh Pitcher & Keywan Riahi & Hans-Holger Rogner & Emilo Lebre La Rovere & , 2004. "Emissions Scenarios: A Final Response," Energy & Environment, SAGE Publishing, vol. 15(1), pages 11-24, January.
  22. repec:dgr:rugggd:200362 is not listed on IDEAS
  23. Bernard, Andrew B & Jones, Charles I, 1996. "Technology and Convergence," Economic Journal, Royal Economic Society, vol. 106(437), pages 1037-44, July.
  24. repec:dgr:rugsom:03c20 is not listed on IDEAS
  25. Bernard, Andrew B & Jones, Charles I, 1996. "Comparing Apples to Oranges: Productivity Convergence and Measurement across Industries and Countries," American Economic Review, American Economic Association, vol. 86(5), pages 1216-38, December.
  26. Jorgenson, Dale W. & Wilcoxen, Peter J., 1992. "Global change, energy prices, and US economic growth," Structural Change and Economic Dynamics, Elsevier, vol. 3(1), pages 135-154, June.
  27. Barro, Robert J & Sala-i-Martin, Xavier, 1992. "Convergence," Journal of Political Economy, University of Chicago Press, vol. 100(2), pages 223-51, April.
  28. Quah, Danny T, 1997. "Empirics for Growth and Distribution: Stratification, Polarization, and Convergence Clubs," Journal of Economic Growth, Springer, vol. 2(1), pages 27-59, March.
  29. William W. Hogan & Dale W. Jorgenson, 1991. "Productivity Trends and the Cost of Reducing CO2 Emissions," The Energy Journal, International Association for Energy Economics, vol. 0(Number 1), pages 67-86.
  30. Warwick J. McKibbin & Peter J. Wilcoxen, 2002. "The Role of Economics in Climate Change Policy," Journal of Economic Perspectives, American Economic Association, vol. 16(2), pages 107-129, Spring.
  31. Jorgenson, Dale W, 1988. "Productivity and Postwar U.S. Economic Growth," Journal of Economic Perspectives, American Economic Association, vol. 2(4), pages 23-41, Fall.
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