Scientists have turned carbon dioxide into stone in a matter of months by pumping it deep underground, offering a revolutionary new way of storing the greenhouse gas to tackle climate change.The pioneering experiment in Iceland mixed CO2 emissions with water and pumped it hundreds of meters (feet) underground into volcanic basalt rock -- where it rapidly turned into a solid. Photo Credit: AFP PHOTO / Kevin Krajick/Lamont-Doherty Earth Observatory

Can turning CO2 to rock fight global warming?

Even Earth has its limits.

Too much carbon dioxide in the oceans makes the water more acidic. Too much carbon dioxide in the atmosphere warms the planet. With emissions from our carbon-based economies still too high, researchers at Columbia’s Lamont-Doherty Earth Observatory are turning CO2 gas to rock as a way to keep CO2 that power plants emit from ever entering the atmosphere.

CO2 gas naturally mineralizes when it reacts with basalt, or volcanic rock, though this process typically happens over hundreds of thousands of years. Speeding up the reaction, Columbia’s research team, the Carbfix Project, captured CO2 gas from an Iceland power plant, pumped it underground into basalt rock, and, in two years, discovered that 95 percent of that injected CO2 gas had become a white, chalky substance. The gas-to-mineral conversion rate was far faster than anticipated.

Researchers are now scaling up the experiment using rock found in abundance in the Earth’s mantle and exploring the vast storage potential of burying CO2-turned-rock beneath oceans off US coasts.

“Iceland was a key demonstration,” said Lamont geophysicist David Goldberg. “The holy grail is off-shore.” Learn more.


See Goldberg talk more about carbon management.


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