A new study argues the cement industry could dramatically cut emissions by switching raw materials. Instead of limestone, scientists propose using carbon-free, calcium-rich silicate rocks like basalt. Because limestone must be heated above 1,500°C—releasing large amounts of CO2—basalt-based production could cut emissions by more than 80% in theory, and by over 25% even with today’s fossil-fuel-heavy energy. The research also suggests existing technologies could enable the change, producing standard Portland cement.
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