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Carbon Capture And Storage or CCS means reducing Global Warming by capturing CO2 from power plants so it is not released into the atmosphere.  Technology for capturing of CO2 is presently commercially available for large CO2 emitters, such as power plants.  However, storage of CO2 is commercially untried and as yet no large scale power plant operates with a full carbon capture and storage system. 

CCS applied to a modern conventional power plant could reduce CO2 emissions by approx 85% compared to a plant without CCS.  Capturing and compressing CO2 requires much energy and would increase the fuel needs of a plant with CCS by around 30%.  These and other system costs are estimated to increase the cost of energy from a power plant with CCS by 30-60%.  Compressed CO2 could be stored in deep geological formations, in the form of mineral carbonates or deep oceans. The later would materially increase 'ocean acidification', a problem that also stems from the excess of carbon dioxide already in the atmosphere and oceans. 

Geological formations are currently considered the most promising sequestration sites, and these are estimated to have a storage capacity of at least 2000 Gt CO2.  Intergovernmental Panel on Climate Change estimates that the economic potential of CCS could be between 10% and 55% of the total carbon mitigation effort until year 2100.