1. IPCC, “Climate change 2007: the physical science basis,” 2007.
2. M. Pidwirny and J. Gulledge, “Carbon cycle,” 2009, http://www.eoearth.org/article/carbon_cycle, accessed on September 16, 2010.
3. IEA, “World energy outlook 2007: executive summary,” 2007.
4. IEA, “Energy technology perspectives: executive summary,” 2010.
5. IEA, “Technology roadmap: carbon capture and storage,” 2009.