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Cement is at the heart of increasing global warming emissions. It's production releases large amounts of CO2 -- both from the chemical process that creates it and the energy consumed in manufacturing. China alone makes 45% of the world's cement, and globally the industry is booming.

That's why two promising new developments related to the production of cement - an ancient and mundane material -- are drawing attention. Reducing CO2 from making cement isn't as sexy as electric cars, but it's the third largest US CO2 producer so there’s an opportunity to make a real contribution.