1. U.S. Energy Information Administration. International energy outlook 2010; 2010. [Online] Available at: http://www.eia.doe.gov/oiaf/ieo/pdf/0484%282010%29.pdf [accessed: 1st February 2011].
2. An F. Global overview on vehicle fuel economy and emission standards; 2010. [Online] Available at: http://www.un.org/esa/dsd/susdevtopics/sdt_pdfs/meetings/egm0809/feng_Global%20Overview%20UN%20NYC%20Aug-09.pdf [accessed: 15th January 2011].
3. U.S. Energy Information Administration. International energy outlook 2010-highlights; 2010. [Online] Available at: http://www.eia.doe.gov/oiaf/ieo/pdf/highlights.pdf [accessed: 5th February 2011].
4. International Energy Agency (IEA). CO2 emissions from fuel combustion; 2010. [Online] Available at: http://www.iea.org/co2highlights/co2highlights.pdf [accessed: 7th December 2010].
5. Pew Centre on Global Climate Change. Transportation sector overview; 2010. [Online] Available at: http://www.pewclimate.org/docUploads/TechBook-TransportationSectorOverview.pdf [accessed: 7th December 2010].