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IPCC, 1992: Emission scenarios for IPCC: an update, In: Climate Change 1992: The Supplementary Report to the IPCC Scientific Assessment [J.T. Houghton, B.A. Callander, and S.K. Varney (eds.)], Section A3, prepared by J. Leggett, W.J. Pepper, and R.J. Swart, and WMO/UNEP, Cambridge University Press, Cambridge, UK 2000 pp.