BRISBANE, United States: Scrubbing carbon dioxide from the air is imperative if humanity is to limit global warming, experts say, and a California startup says it can do just that, using limestone as a carbon-sucking sponge.

San Francisco-based Heirloom Carbon has become a hot name in the nascent capture technology sector, even sealing a deal with Microsoft to help the Windows-maker meet its zero-carbon ambitions.

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