1. Intergovernmental Panel on Climate Change. Third Assessment Report: the Scientific Basis [Online]. 2001. Available: http://www.ipcc.ch/ [15 October 2003].
2. Energy, Society and Environment. Routledge: London, 1997.
3. Department of Trade and Industry. Hewitt announces biggest ever expansion in renewable energy. Press Release P/2003/403. [Online]. 2003. Available: http://www.gnn.gov.uk/gnn/national.nsf/TI/E5FB18E70F205F8080256D630034F27A?opendocument [5 December 2003].