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Cement formed with biogenic limestone promises carbon-neutral concrete

concrete

 

Playing an indispensable role in global construction, cement contributes around seven percent of annual greenhouse gas emissions owing to its carbon-intensive production process. Scientists at the University of Colorado Boulder claim to have uncovered a greener path forward by tapping into a species of cloudy microalgae, which naturally produce limestone particles through photosynthesis and could turn buildings into carbon sinks as a result.

 

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