Gap Fill - Level 5


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   atmosphere      enthusiastic      fast      ground      larger      less      permanent      planet      problem      project      quickly      rising      smart      storage      substance      surprise      them      tons      underground      volcanic  
Scientists have a but simple way to deal with carbon dioxide emissions – to turn back into stone. Researchers in Iceland pumped 220 of CO2 deep underground into rock. It reacted with the rock and relatively , it transformed into a solid similar to limestone. The team were surprised at how the conversion happened. Lead scientist Juerg Matter said: "Of our 220 tons of injected CO2, 95 per cent was converted to limestone in than two years….It was a huge to all the scientists involved in the , and we thought, 'Wow!'"

The scientists hope their experiment now moves to a scale. It could help the of CO2 emissions entering the and warming the . It could also be a key technique in carbon capture and (CCS) solutions. Many other CCS techniques have involved injecting CO2 , but there was always the problem of the emissions leaking back above and into the atmosphere. Dr Matter was about the experiments. He said: "We need to deal with carbon emissions and this is the ultimate storage – turn them back to stone."

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