In a small geodesic dome in the above-ground environment of Iceland’s massive Hellisheidi geothermal power plant, Ólafur Teitur Guðnason is demonstrating a new approach to storing CO2 emissions that is attracting global attention. In the dome, owned by Icelandic startup Carbfix, CO2 piped in from a nearby power plant is mixed with water pumped from the ground and injected into the basalt rock below. In the nine years since the company began injecting CO2 from the power plant, 95 % has turned into a rock in the subsurface in less than two years, says Guðnason, Carbfix's communications director. The water acts as a carrier and kills the buoyancy of the CO2 and radically accelerates the naturally occurring process of CO2 mineralization when it comes into contact with the basalt. "Our technology accelerates processes that normally occur on geological timescales. Instead of taking thousands of years (to mineralize CO2 into rock), we can do it in two years."Terry Slavin)