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Direct air capture using limestone as a sponge — passive, cheap, and scalable. Building megaton-scale removal capacity.
- Category
- Other
- Funding
- VC-backed
Sources, checked Sep 26, 2026. A fact that is missing is one we could not source, not a zero.
- Summary: our summary, checked against heirloomcarbon.com
- Funding: mitsui.com — “Invests in Heirloom Carbon”
Category is our own classification. Spotted something wrong? Tell us.
Frequently asked questions
What does Heirloom Carbon do?
Direct air capture using limestone as a sponge — passive, cheap, and scalable. Building megaton-scale removal capacity.
Where is Heirloom Carbon based?
Location for Heirloom Carbon has not been disclosed publicly.
How much has Heirloom Carbon raised?
Heirloom Carbon is vc-backed. We have not verified a funding amount.