Oil recovery practices leave behind a large resource of “stranded oil”. Such stranded oil provides a substantial target for enhanced oil recovery technology. Emerging, advanced EOR technologies such as CO2 first tried in 1972 could double the incremental oil recovery. Until recently, most of the CO2 used for EOR has come from naturally-occurring reservoirs. But new technologies are being developed to produce CO2 from industrial applications such as natural gas processing, fertilizer, ethanol, and hydrogen plants in locations where naturally occurring reservoirs are not available