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Peter B. Kelemen, a Columbia University geologist, near Muscat, Oman, March 13, 2018. Scientists say that if carbon mineralization, a natural process found in some of Oman's rocks, could be harnessed, accelerated and applied inexpensively on a huge scale — admittedly some very big “ifs” — it could help fight climate change. (Vincent Fournier/The New York Times)