1. Department of Environment Food and Rural Affairs (DEFRA) Delivering Emission Reductions, 2002, http://www.defra.gov.uk/environment/climatechange/cm4913/pdf/section2.pdf.
2. Intergovernmental Panel on Climate Change (IPCC), 2002, http://www.ipcc.ch/.
3. Royal Commission on Environmental Pollution 22nd Report, June 2000, http://www.rcep.org.uk.
4. Performance and Innovation Unit (PIU) Report, The Energy Review, The Cabinet Office, February 2002, http://www.piu.gov.uk/2002/energy/report/.
5. Department of Trade and Industry, Inter-Departmental Analysts Group Report, Long Term Reductions in Greenhouse Gas Emissions in the UK, February 2002, http://www.dti.gov.uk/energy/greenhousegas.