“Turning CO2 to Stone”

It won’t help us reverse the effects of global warming fast enough, but there is a way to lock CO2 into a more permanent form.

At Iceland’s Hellisheidi Power Plant, Lamont hydrologist Martin Stute, Adjunct Senior Research Scientist Juerg Matter, and colleagues tried something different. They used CO2 captured at the power plant, and mixed it with water and hydrogen sulfide, creating soda-like carbonation, then injected the mixture into porous basalt rocks 400 to 800 meters underground. Basalt, which is created as lava cools, contains calcium, iron, and magnesium, which react naturally with CO2 to form solid carbonate minerals. Within two years, 95 percent of the injected CO2 had turned to mineral – far faster than the 8–12 years originally expected.

Source: Turning CO2 to Stone – Science Bulletin

A “cool” technique, but it might take a while for it to be adopted on a grand scale.