Geological storage of CO2: What do we know, where are the gaps and what more needs to be done?

If deep reductions in anthropogenic greenhouse gas emissions are to be achieved, the introduction of CO2 capture and storage in geological reservoirs is likely to be necessary. The technology would be deployed alongside other mitigation measures such as renewables, energy efficiency and fuel switching. Currently, research programmes on the geological storage of CO2 are underway in the United States, the European Union, Australia and Japan.