In this July 28, 2011, photo, superheated steam laden with carbon dioxide 

In this July 28, 2011, photo, superheated steam laden with carbon dioxide and hydrogen sulfide billow from a test well in the volcanic field at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. In the CarbFix experiment, scientists will separate out the CO2 and pump it underground to react with porous basalt rock, forming limestone, to see how well the gas most responsible for global warming can be locked away in harmless form. (AP Photo/Brennan Linsley)
Associated Press
In this July 28, 2011, photo, superheated steam laden with carbon dioxide and hydrogen sulfide billow from a test well in the volcanic field at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. In the CarbFix experiment, scientists will separate out the CO2 and pump it underground to react with porous basalt rock, forming limestone, to see how well the gas most responsible for global warming can be locked away in harmless form. (AP Photo/Brennan Linsley)
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