Abandoned Mines as Carbon Vaults: How Rewind Earth Is Turning Toxic Liabilities Into Climate Assets
Most CDR companies are building something new. Rewind Earth is repurposing something old — and toxic. The company takes sustainably sourced biomass and stores it in deep underground mine chambers where oxygen-free conditions prevent decomposition. The carbon stays locked away. And the mines themselves benefit: less acid drainage, reduced land subsidence risk, lower methane emissions. The Approach Rewind’s flagship project operates in a deep mine in Georgia (the US state, not the country). The concept is elegant: abandoned mines are environmental liabilities — they leak acidic water, release methane, and pose collapse risks. By filling them with biomass, Rewind addresses multiple problems simultaneously. ...