New technique could make cement manufacturing carbon-neutral

Concrete surrounds us in our cities and stretches across the land in a vast network of highways. Many aren’t aware that concrete’s key ingredient, ordinary portland cement, is a major producer of greenhouse gases. Each year, manufacturers produce around 5 billion tons of portland cement, for every ton of cement produced, the process creates approximately a ton of carbon dioxide, all of which accounts for roughly 7 percent of the world’s carbon dioxide emissions.
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