In this July 28, 2011 photo, Bergur Sigfusson, the CarbFix experiment's technical manager, inspects a test well at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. CarbFix's scientists will separate carbon dioxide from the volcanic field's steam 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, Bergur Sigfusson, the CarbFix experiment's technical manager, inspects a test well at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. CarbFix's scientists will separate carbon dioxide from the volcanic field's steam 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)
In this July 28, 2011 photo, Bergur Sigfusson, the CarbFix experiment's technical manager, inspects a test well at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. CarbFix's scientists will separate carbon dioxide from the volcanic field's steam 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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