1. IPCC. IPCC fourth assessment report: climate change 2007 (AR4); 2007. .
2. IEA. IEA Statistics 2012 Edition: CO2 emissions from fuel combustion highlights. Paris: International Energy Agency; 2012.
3. IEA. World Energy Outlook 2011. Paris: International Energy Agency; 2011.
4. EU Energy roadmap 2050, European Union, European Commission; 2012.
5. Experimental investigation of high temperature and high pressure coal gasification;Tremel;Appl Energy,2012