Carbon dioxide capture and storage (CCS) technologies can drastically reduce future CO2 emissions. This IEA study introduces a scenario analysis of the future role of CCS and presents the main uncertainties that surround a CCS policy strategy. It provides detailed estimates of the likely CO2 reductions available from CCS under a variety of technological and economic scenarios and suggests policies designed to achieve significant reduction of emissions. Carbon dioxide capture and storage (CCS) technologies can drastically reduce future CO2 emissions. This IEA study introduces a scenario analysis of the future role of CCS and presents the main uncertainties that surround a CCS policy strategy. It provides detailed estimates of the likely CO2 reductions available from CCS under a variety of technological and economic scenarios and suggests policies designed to achieve significant reduction of emissions.