Carbon capture and storage (CCS) technologies aim to reduce harmful carbon-dioxide emissions by diverting them underground, rather than into the atmosphere. Now, for the first time, Juerg Matter of the University of Southampton in the UK and colleagues have shown that carbon dioxide can be disposed of permanently by being mineralised to benign carbonate minerals in basaltic rocks. The team found that it took less than two years for more than 95% of the carbon dioxide injected into the CarbFix site about 25 km from Reykjavik in Iceland to be immobilised this way. Previously, it was thought that such processes take several hundreds to thousands of years, and the results therefore hold promise for CCS solutions.