Frontier, the carbon removal clearinghouse founded by Google, Strip, Shopify, and others, announced today that it is buying 115,208 metric tons of carbon removal credits from geoengineering startup Planetary in a deal worth $31.2 million.

Where most Frontier deals to date have bought carbon from startups specializing in direct air capture , enhanced weathering , or bioenergy with carbon capture , the organization’s agreement with Planetary is its first to do so by enhancing ocean alkalinity.

The deal effectively prices each metric ton of carbon at $270, though Planetary says it has a plan to eventually remove carbon for less than $100 per metric ton. At full tilt, ocean alkalinity enhancement could remove over 1 billion metric tons of carbon dioxide annually.

For decades, the

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