Carbon capture and storage (CCS) involves absorbing carbon dioxide, transporting it to a storage site, then injecting it underground so that it is not released in the atmosphere. The practice allows fossil fuel power plants–particularly coal-fired stations–to operate with significantly reduced carbon emissions. CCS can also be used to capture and store carbon dioxide from industrial sources, such as cement or steel producers. The process is still undergoing development, but a few pilot plants are already in operation to test CCS.