Significant quantities of oil can be extracted using Enhanced Oil Recovery (EOR) methods. One of the main methods of this type is CO2-EOR, which also has a positive impact on the environment as it results in the practically permanent storage of CO2, the main greenhouse gas (GHG). When its use is economically viable, the technology for extracting oil using CO2 (CO2-EOR) enables significant quantities of oil to be obtained and at the same time, provides storage for large volumes of CO2. It thus brings in both financial profits and environmental benefits if the oil extracted is used instead of crude oil obtained by conventional methods and does not entail any increase in consumption. This book discusses the different methods of EOR, as well as all of the economic benefits and impacts it has on the environment.