Carbon capture and sequestration (CCS) is a set of technologies that can greatly reduce carbon dioxide emissions from new and existing coal- and gas-fired power plants, industrial processes and other stationary sources of carbon dioxide (CO2). It is a three-step process that includes capture of carbon dioxide from power plants or industrial sources; transport of the captured and compressed carbon dioxide (usually in pipelines); and underground injection and geologic sequestration (permanent storage) of that carbon dioxide in rock formations that contain tiny openings or pores that trap and hold the gas.