1. IEA, 2000. Technology paths for the global electricity system. International Energy Agency, Paris.
2. IEA, 2001. World Energy Outlook: 2001 Insight. Assessing today’s supplies to fuel tomorrow’s growth. International Energy Agency, Paris. ISBN 92-64-19658-7, 401 pp. Available from .
3. IPCC, 2001a. Climate Change 2001 (3 volumes). United Nations Intergovernmental Panel on Climate Change. Cambridge University Press, UK. Available from .
4. IPCC, 2001b. Climate Change 2001. In: Metz, B., Davidson, O., Swart, R., Pan, J. (Eds.), Mitigation. United Nations Intergovernmental Panel on Climate Change. Cambridge University Press, UK. ISBN 0-521-01502-2, 751 pp. Available from .
5. Shell, 1997. The evolution of the world’s energy system. Shell International Limited Report, Shell Centre, London, UK, 7 pp.