Microsoft is helping to fund one of the US’s first hubs for pulling planet-heating carbon dioxide out of the air. It struck a deal with California-based startup Heirloom , which says it will capture up to 315,000 metric tons of CO2 for Microsoft over the next decade or so. The partnership fits into Microsoft’s climate goal of becoming carbon negative by 2030, meaning it plans to remove more carbon dioxide from the atmosphere than it emits as pollution. The company has made other deals with