Study raises new doubts about carbon storage

The capture and storage of CO2 deep underground may prove an environmentally risky solution to global warming, a US government experiment revealed.

US researchers who injected carbon dioxide in a depleted oil field in Texas found it caused the minerals underground to dissolve, raising fresh doubts about carbon capture and storage technology as a viable solution to global warming.
Yousif Kharaka, the geochemist who led the experiment, said the 1,600 tonnes of liquid CO2 injected underground changed the acidity of the minerals, causing them to dissolve. This, she said, has environmental implications as the liquid CO2 could then leak into ground water or find its way back into the atmosphere and aggravate the greenhouse effect. The results of the study, performed in October 2004, were published in the July 2006 edition of journal Geology.

EurActiv