1. IPCC , Climate Change 2007: Synthesis Report. Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, ed. Core Writing Team, R. K. Pachauri and A. Reisinger,IPCC, Geneva, Switzerland, 2007, 104p.
2. IPCC , Carbon Dioxide Capture and Storage, ed. B. Metz, O. Davidson, H. de Coninck, M. Loos and L. Meyer, Cambridge University Press, UK, 2005, p. 431
3. S. C. Davis , S. W.Diegel and R. G.Boundy, Transportation Energy Data Book: Edition 28, 2009, ORNL-6984 (Edition 28 of ORNL-5198), Table 11.4
4. EPA , Average Carbon Dioxide Emissions Resulting from Gasoline and Diesel Fuel, 2005, EPA420-F-05-001
5. Dr Pieter Tans , NOAA/ESRL, www.esrl.noaa.gov/gmd/ ccgg/trends