Gap Fill - Level 4


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   atmosphere      enthusiastically      fast      huge      key      less      permanent      planet      problem      research      rising      simple      storage      substance      surprised      them      tons      underground      volcanic      Wow  
Scientists have found a way to deal with carbon dioxide emissions – turn back into stone. They pumped 220 of CO2 underground into rock. It reacted with the rock and changed into a like limestone. The team were at how this happened. Dr Juerg Matter said: "Of our 220 tons of injected CO2, 95 per cent was converted to limestone in than two years….It was a surprise…and we thought, '!'"

The scientists hope their will go large scale to help the of CO2 in the atmosphere and a warming . It could be a method in carbon capture and (CCS). Earlier CCS techniques also involved injecting CO2 , but it often leaked back into the . Dr Matter said: "We need to deal with carbon emissions and this is the ultimate storage – turn them back to stone."

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