Heirloom is a company founded in 2020 with the mission of mitigating the worst impacts of climate change through the development of the world’s most cost-effective CO2 removal technology. Their slogan, “Mitigating the worst impacts of climate change by developing the world’s most cost-effective CO2 removal technology,” reflects their dedication to combating global climate issues. Heirloom's focus is on developing Direct Air Capture (DAC) technology to permanently remove CO2 from the atmosphere, using a process that accelerates the natural processes enabling limestone to absorb carbon dioxide from the air from years to days. In 2023, Heirloom achieved a significant milestone by establishing the first and only Direct Air Capture facility in North America that permanently captures CO2. Their notable clientele includes major corporations such as Microsoft, JP Morgan, McKinsey, Stripe, and Shopify, positioning them as a key player in the carbon removal market. The company received a $1.00M grant investment on 22 April 2022, with backing from prominent investors including XPRIZE and the Musk Foundation. This backing indicates industry confidence in Heirloom's technological advancements and their potential to make a significant impact on the fight against climate change.