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Power plant turns carbon dioxide into stone

A pilot project has been going on for some time at the Icelandic geothermal power plant Hellisheidi. It is run by the Swiss startup Climeworks and uses a filter system and the “Direct Air Capture” method to transform CO2 into stone. The technology collects CO2 from ambient air onto a patented filter, binds it to water, and then pumps it 700 m underground. On contact with the deep basalt rock, the CO2 solution quickly forms into a carbonate mineral, binding the carbon dioxide underground for at least 1 million years.

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