1. Pachauri, R. K. & Reisinger, A. (eds) Climate Change 2007: Synthesis Report (Intergovernmental Panel on Climate Change, Cambridge, UK, 2007)
2. Council of the European Union. Presidency Conclusions – Brussels, 22/23 March 2005 (European Commission, 2005)
3. Canadell, J. G. et al. Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks. Proc. Natl Acad. Sci. USA 104, 18866–18870 (2007)
4. Clarke, A. W. & Trinnaman, J. A. (eds) 2007 Survey of Energy Resources (World Energy Council, 2007)
5. Rempe, H., Schmidt, S. & Schwarz-Schampera, U. Reserves, Resources and Availability of Energy Resources 2006 (German Federal Institute for Geosciences and Natural Resources, 2007)