1. International Energy Agency World Energy Outlook 2004
http://www.iea.org/Textbase/publications/free_new_Desc.asp?PUBS_ID=1266
2. IPCC Special Report: Carbon Dioxide Capture and Storage
http://arch.rivm.nl/env/int/ipcc/pages_media/SRCCS-final/ccsspm.pdf
(2005).
3. Kharaka, Y. K. et al. Geology 34, 577–580 (2006).