1. CO 2 Emissions from Fuel Combustion, 2010 Edition 2010 http://www.iea.org/co2highlights/co2highlights.pdf
2. World Energy Scenarios to 2050: Issues and Options 2009 http://www.nezhadpmd.com/worldenergyscenarios.pdf
3. Carbon Capture & Storage: Assessing the Economics 2008 http://ww1.mckinsey.com/clientservice/sustainability/pdf/CCS_Assessing_the_Economics.pdf