In this July 28, 2011, photo a complex of pipes, ducts and valves connects to giant turbines inside Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from the steam in this volcanic field 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 a complex of pipes, ducts and valves connects to giant turbines inside Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from the steam in this volcanic field 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 a complex of pipes, ducts and valves connects to giant turbines inside Reykjavik Energy's Hellisheidi geothermal power plant in Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from the steam in this volcanic field 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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