Heirloom Carbon Technologies is a direct air capture (DAC) company that accelerates the natural ability of limestone to absorb CO2 from the atmosphere — compressing a geological process from years into days. Its renewable-energy-powered facilities permanently store captured carbon underground, and it sells verified carbon removal credits to corporate customers including Microsoft, JPMorgan, Stripe, and Shopify. The company operates North America's first commercial DAC facility in Tracy, California, and is expanding with two new facilities in Northwest Louisiana targeting ~320,000 tonnes of CO2 per year.