Direct air capture has gone commercial in the United States for the first time, with Heirloom Carbon Technologies opening a plant in Tracy, California that can pull 1,000 metric tons of CO2 straight from the sky each year. The company speeds up a natural process: heating limestone, then letting the mineral soak up atmospheric carbon on open-air trays in days rather than years. The captured CO2 is locked into concrete and stored underground, with companies like Microsoft and Shopify buying removal credits to fund operations. Heirloom went from capturing one kilogram to one million kilograms in just over two years, and hopes to keep copying the design. Tackling legacy emissions, not just new ones, may be essential to stabilizing the climate worldwide.