The water solution both slows the escape of the gas and speeds up the chemical reaction. The project began to inject part of the C02 from the HellisheiSi geothermal power plant in 2012, and has found that over 95% of the C02 is mineralized already after 2 years (CarbFix, 2016). A drawback isthatthe method requires basaltic rocks with relatively high concentrations of calcium, magnesium and iron, and with sufficient porosity to capture the C02. These are primarily found in young basalts near oceanic rift zones. Apart from Iceland and a number of usually small volcanic islands, such rift zones are usually located in deep ocean, which makes transporting and injecting the C02 a challenge.