The urban jungle just got a bit greener and with nary the presence of a tree, thanks to UK-based start-up Novacem. The company has developed a “carbon-negative” cement that absorbs more greenhouse gases over its life cycle than it emits. If adopted on a wide scale, this innovation could  have a huge impact on the overall health of the environment, given that the annual production of conventional Portland cement is responsible for an estimated five percent of global CO2 emissions, more than the airline industry.

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