Heirloom

Permanent carbon removal at the lowest cost

AISeries BEst. 202050-200 employeesSan Francisco

Heirloom accelerates the natural process of rock weathering — using crushed limestone to pull CO₂ from the atmosphere. Their approach achieves durable carbon removal at a fraction of the cost of other methods, with the first commercial facility operational in California.

Total Raised$150M

MicrosoftCarbon DirectBreakthrough Energy Ventures

Founders

Shashank Samala

Noah McQueen

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