CATO is the acronym for CO2 Afvang, Transport en Opslag, which is Dutch for CO2 capture, transport and storage. Capture and storage of the greenhouse gas carbon dioxide (CO2) could free fossil fuelled combustion installations from a major burden. Carbon dioxide Capture and Storage (CCS) technologies extract the CO2 released during the combustion process, transport it and store it in a safe place to ensure that the CO2 does not enter the atmosphere. For many years CCS has held out this promise. By decarbonising fossil fuels such as coal and natural gas, they could become ‘cleaner' in terms of climate change. Emissions of the main greenhouse gas CO2 into the atmosphere could be largely reduced. But the technologies are still very young, particularly for application at large power stations. Since 2004, the CATO research programme has concentrated on bridging the gap between the potential and the reality.