Global carbon dioxide emissions scenarios: Sensitivity to social and technological factors in three regions



Carbon dioxide emissions from 1990 to 2100 AD are decomposed into the product of four factors: population size, affluence (measured here as GDP per capita), energy intensity (energy use per unit GDP) and carbon intensity (carbon dioxide emissions per unit energy). These emissions factors are further subdivided into three regions: more developed countries (MDCs), China, and the remaining less developed countries (LDCs). Departures from a baseline scenario (based on IPCC, 1992a — the so-called ‘business-as-usual’ scenario) are calculated for a variety of alternative assumptions concerning the four emissions factors in the three regions. Although the IPCC scenario is called a ‘non-intervention’ scenario, it is shown, for example, that large decreases in energy intensity in China or carbon intensity in MDCs are built into the ‘business as usual’ case — and such large changes vary considerably from region to region. We show what CO2 emissions would look like if each of these four emissions factors projected in the baseline case somehow remained constant at 1990 levels. Certain factors like energy intensity improvements and long-term population growth in LDCs, or GDP growth and carbon intensity improvements in MDCs, are shown to have a big contribution to cumulative global emissions to 2100 AD, and consequently, changes in these projected factors will lead to significant deviations from baseline emissions. None of the scenarios examined in this analysis seems to indicate that any one global factor is clearly dominant, but cultural, economic, and political costs or opportunities of altering each factor may differ greatly from country to country.


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  1. Ausubel, J.H.: 1996, ‘The liberation of the environment’,Daedalus 125(3), 1–17.Google Scholar
  2. Birdsall, N.: 1992, ‘Another look at population growth and global warming’, Policy Research Working Papers. World Bank, 1–45.Google Scholar
  3. Bongaarts, J.: 1992, ‘Population growth and global warming’,Population and Development Review 18, 299–319.CrossRefGoogle Scholar
  4. Bos, E., Vu, M.T., Massiah, E. and Bulatao, R.A.: 1994, ‘World population projections’, World Bank.Google Scholar
  5. Cline, W.: 1992,The Economics of Global Warming. Washington, D.C., Institute for International Economics.Google Scholar
  6. Cohen, J.E.: 1995,How Many People Can The Earth Support, New York, Norton.Google Scholar
  7. Costanza, R. and Daly, H.E.: 1992, ‘Natural capital and sustainable development’,Conservation Biology 6(1), 37–46.CrossRefGoogle Scholar
  8. Daily, G.C. and Ehrlich, P.R.: 1992, ‘Population, sustainability, and earth’s carrying capacity’,Bio-Science 42(10), 761–771.Google Scholar
  9. Daly, H.E. and Townsend, K.N. (eds.): 1993,Valuing the Earth, Cambridge, MIT Press.Google Scholar
  10. Ehrlich, P.R. and Holdren, J.P.: 1971, ‘Impact of population growth’,Science 171, 1212–1217.Google Scholar
  11. Gaskins, D. and Weyant, J.: 1993, ‘EMF-12: Model comparisons of the costs of reducing CO2 emissions’,American Economic Review 83, 318–323.Google Scholar
  12. Goulder, L. and Schneider, S.H.: 1998, ‘Induced Technological Change, Crowding Out, And the Attractiveness of CO2 Emissions Abatement’,Resource and Energy Economics (submitted).Google Scholar
  13. Hoffert, M.I., Caldeira, K., Jain, A.K., Haites, E.F., Harvey, L.D.D., Potter, S.D., Schlesinger, M.E., Schneider, S.H., Watts, R.G., Wigley, T.M.L. and Wuebbles, D.J: 1998, Energy Implications of CO2 Stabilization,Nature (submitted).Google Scholar
  14. Holdren, J.: 1991, “Population and the energy problem’,Population and Environment 12(3), 231–255.CrossRefGoogle Scholar
  15. Intergovernmental Panel on Climate Change: 1990, in Houghton, J.T., Jenkins, G.J. and Ephraums (eds.),Climate Change: The IPCC Scientific Assessment. Cambridge Cambridge University Press.Google Scholar
  16. Intergovernmental Panel on Climatic Change (IPCC): 1992, in Houghton, J.T., Callander, B.A., and Varney, S.K. (eds.),Climate Change 1992: The Supplementary Report to the IPCC Scientific Assessment. Cambridge, Cambridge University Press.Google Scholar
  17. Intergovernmental Panel on Climatic Change (IPCC): 1994, in Houghton, J.T., Meira Filho, L.G., Bruce, J., Hoesung Lee, Callander, B.A., Haites, E., Harris, N. and Maskell, K (eds.),Climate Change 1994: Radiative Forcing of Climate Change and An Evaluation of the IPCC IS92 Emission Scenarios. Cambridge, Cambridge University Press.Google Scholar
  18. Intergovernmental Panel on Climatic Change (IPCC): 1996a, in Houghton, J.T., Meira Filho, L.G., Callander, B.A., Harris, N., Kattenberg, A. and Maskell, K. (eds.),Climate Change 1995. The Science of Climate Change: Contribution of Working Group I to the Second Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, Cambridge University Press.Google Scholar
  19. Intergovernmental Panel on Climatic Change (IPCC): 1996b, in Watson, R.T., Zinyowera, M.C. and Moss, R.H. (eds.)Climate Change 1995. Impacts, Adaptations and Mitigation of Climate Change: Scientific-Technical Analyses. Contribution of Working Group II to the Second Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, Cambridge University Press.Google Scholar
  20. Intergovernmental Panel on Climatic Change (IPCC): 1996c, in Bruce, J.P., Lee, H. and Haites, E.F. (eds.),Climate Change 1995. Economic and Social Dimensions of Climate Change. Contribution of Working Group III to the Second Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, Cambridge University Press.Google Scholar
  21. Johansson, T.B., Kelly, H., Reddy, A.K.N. and Williams, R.H. (eds.): 1993,Renewable Energy: Sources for Fuels and Electricity. Washington, D.C., Island Press.Google Scholar
  22. Kaya, Y., Nakicenovic, N., Nordhaus, W.D. and Toth, F.L. (eds.) 1993,Costs, Impacts, and Benefits of CO 2 Mitigation, Laxenburg, Austria, International Institute for Applied Systems Analysis.Google Scholar
  23. Land, K.C. and Schneider, S.H.: 1987, ‘Forecasting in the social and natural sciences: An overview and analysis of isomorphisms’,Climatic Change 11,(1/2), 7–34.CrossRefGoogle Scholar
  24. Morgan, M.G. and Dowlatabadi, H.: 1996, ‘Learning from integrated assessment of climate change’,Climatic Change 34(3/4), 337–368.CrossRefGoogle Scholar
  25. Morgan, M.G. and Keith, D.W.: 1995, ‘Subjective judgments by climate experts’,Environmental Science and Technology 29, 468A-476A.Google Scholar
  26. Nakicenovic, N.: 1996, ‘Freeing energy from carbon’,Daedalus 125(3), 95–112.Google Scholar
  27. Rahman, A., Robins, N. and Roncerel, A.: 1993,Exploding the Population Myth-Consumption versus Population: Which is the Climate Bomb? England, Castle Cary Press.Google Scholar
  28. Root, T.L. and Schneider, S.H.: 1995, ‘Ecology and climate: research strategies and implications’,Science 269,: 331–341.Google Scholar
  29. Santer, B.D., Taylor, K.E., Wigley, T.M.L., Johns, T.C., Jones, P.D., Karoly, D.J., Mitchell, J.F.B., Oort, A.H., Penner, J.E., Ramaswamy, V., Schwarzkopf, M.D., Stouffer, R.J. and Tett, S.: 1996, ‘A search for human influences on the thermal structure of the atmosphere’,Nature 382, 39–46.CrossRefGoogle Scholar
  30. Schneider, S.H.: 1998, ‘Kyoto Protocol: The Unfinished Agenda’ Editorial inClimatic Change 39(1), 1–21.Google Scholar
  31. Schneider, S.H.: 1997, ‘Integrated assessment modeling of global climate change: Transparent rational tool for policy making or opaque screen hiding value-laden assumptions?Environmental Modelling and Assessment 2(4), 229–248.CrossRefGoogle Scholar
  32. Schneider, S.H.: 1994, ‘Detecting climatic change signals: Are there any ‘fingerprints’?’Science 263, 341–347.Google Scholar
  33. Schneider, S.H. and Goulder, L.: 1997, ‘Achieving carbon dioxide concentration targets: what needs to be done now’,Nature 389, 13.CrossRefGoogle Scholar
  34. United Nations: 1995,World Economic and Social Survey 1995: Current Trends and Policies in the World Economy, New York, United Nations.Google Scholar
  35. Wigley, T.M.L., Richels, R. and Edmonds, J.A. 1996, ‘Economic and environmental choices in the stabilizations of atmospheric CO2 concentrations’,Nature 379, 240–243.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  1. 1.Dept. of Biological SciencesStanford UniversityStanfordU.S.A.

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