The purpose of Joule II Project Number CT92-0031 'The Underground Disposal of Carbon Dioxide' was to examine the potential for reducing CO2 emissions to the Earth's atmosphere from fossil fuel fired power plant by disposing of this CO2 underground. The report discusses whether this could be done practically, safely and economically, with minimal long term effects on man or the global environment. The report concentrates on the CO2 disposal process but also includes a detailed study of the technical and economic optimisation of CO2-removal in a lignite-fired IGCC power plant. The report is available for download at http://nora.nerc.ac.uk/502763/.