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Industrial waste can turn planet-warming carbon dioxide into stone

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Robert F. ServiceIn July 2019, Gregory Dipple, a geologist at the University of British Columbia, Vancouver, hopped on a 119-seat charter flight in Yellowknife, Canada, and flew 280 kilometers northeast to the Gahcho Kué diamond mine, just south of the Arctic Circle.

Gahcho Kué, which means “place of the big rabbits” in the Dënësu¸łinë language of the region’s native Dené or Chipewyan people, is an expansive open pit mine ringed by sky-blue lakes.

There, the mining company De Beers unearths some 4 million carats’ worth of diamonds annually. But Dipple and two students weren’t there for gems.

Rather, they were looking to use the mine’s crushed rock waste as a vault to lock up carbon dioxide (CO2) for eternity.At Gahcho Kué, Dipple’s team.

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