Senior Mechanical Engineer, Heirloom

Initially, the company stored captured carbon in underground deposits, but it now also boasts the ability to sequester CO₂ into concrete. This process, which was developed alongside its partner, CarbonCure, actually strengthens the concrete, which can then be used in all types of construction projects.

Crucially, because limestone is so widely available - and because the capture process is a chemical reaction - the technology required relatively little land and energy. As a result, the company can operate with a comparatively low environmental footprint, increasing the value of the carbon removal credits it generates. That advantage helped secure a major agreement with Microsoft, which purchases 315,000metric tons of carbon removal from the company in one of the largest deals of its kind to date.