This July 28, 2011, photo shows part of one of four giant turbines inside Reykjavik Energy's Hellisheidi geothermal power plant, fed by steam from the surrounding volcanic field, in Reykjavik, Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from Hellisheidi'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
This July 28, 2011, photo shows part of one of four giant turbines inside Reykjavik Energy's Hellisheidi geothermal power plant, fed by steam from the surrounding volcanic field, in Reykjavik, Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from Hellisheidi'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)
This July 28, 2011, photo shows part of one of four giant turbines inside Reykjavik Energy's Hellisheidi geothermal power plant, fed by steam from the surrounding volcanic field, in Reykjavik, Iceland. Scientists in the CarbFix experiment will separate carbon dioxide from Hellisheidi'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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