In this July 28, 2011 photo, giant ducts carry superheated steam from within a volcanic field to the turbines at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from the 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, giant ducts carry superheated steam from within a volcanic field to the turbines at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from the 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, giant ducts carry superheated steam from within a volcanic field to the turbines at Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from the 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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