Another problem with CCS is storage sites. If liquid CO2 is stored too close to the surface, it can escape and get into the atmosphere, which is precisely the opposite from the intended action. So it needs to be buried underground safely, far from water not to contaminate it and far from earthquake areas. Searching for the proper sites requires additional investment.
Captured carbon can be stored close to partially emptied oil fields, which helps to push the deeper layers of underground fuel up. Hence, carbon can be used by oil companies for extracting more fuel to burn (and as a result, release more pollution from their operations into the air and water). This scheme is called Enhanced Oil Recovery (EOR) and could be one of the reasons for CCS technologies to progress. However, is this the right reason to have?