1. Clark WC, Munn RE (eds) (1986) Sustainable development of the biosphere. Cambridge University Press, Cambridge, ch 1
2. Encyclopaedia Britannica Inc. (ed) (1976) Encyclopaedia Britannica, Micropaedia IX. Encyclopaedia Britannica Inc., Chicago
3. Houghton JT, Jenkins GJ, Ehpraums JJ (eds) (1990) Climate change: the IPCC scientific assessment. Cambridge University Press, Cambridge
4. Houghton JT et al. (eds) (1996) 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 University Press, Cambridge
5. Houghton JT et al. (eds) (2001) Climate change 2001, the scientific basis. Working group I contribution to the Third Assessment Report of the IPCC. Cambridge University Press, Cambridge