Energy & Science
Carbon-Capture Startup Using Dirt Cheap Material Raises $53 Million
Heirloom uses cheap and widely available limestone to suck carbon from the air. The latest funds will help build its first pilot-scale facility
Piles of limestone at a warehouse in Brazil.
Photographer: Dado Galdieri/BloombergThis article is for subscribers only.
A California-based startup has found a way to use limestone — a cheap and widely available material — to remove carbon dioxide directly from the air, potentially overcoming a major hurdle in scaling up the technology needed to avoid catastrophic global warming.
Heirloom Carbon Technologies Inc. said Thursday it raised $53 million from investors including Breakthrough Energy Ventures, a clean-technology fund led by Bill Gates, and the Microsoft Climate Innovation Fund.