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In this July 28, 2011 photo, Bergur Sigfusson, the CarbFix experiment's technical manager, surveys 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.

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That CO2 warming the world: Lock it in a rock

Sometime next month, on the steaming fringes of an Icelandic volcano, an international team of scientists will begin pumping "seltzer water" into a deep hole, producing a brew that will lock away carbon dioxide forever.


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