1. SCEP (1970) Man’s impact on the global climate: Report of the Study of Critical Environmental Problems, The MIT Press, Cambridge, Mass. 319 pp.
2. SMIC (1971) Inadvertent Climate Modification: Report of the Study of Man’s Impact on Climate, The MIT Press, Cambridge, Mass. 308 pp.
3. Report;WMO,1979
4. Neftel, A. (1985) Evidence from polar ice cores for the increase in atmospheric carbon dioxide in the past two centuries. Nature, vol 315, p 45.
5. IPCC (1990) Climate Change, Report of the Intergovemmental Panel on Climate Change, WMO/UNEP, Cambridge University Press. See also IPCC Working Group II & III, WMO/UNEP, UNEP, Nairobi.