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> happens naturally in the ocean

That's not fast enough and also risks making the ocean too acidic.

> Injecting CO2 into rocks "all by itself" is extremely slow

By injection I meant injection. Drilling a deep hole and pushing the CO2 out the other end.

Only the reaction happens by itself.

With the right structure underground the CO2 can spread over an enormous surface area at a high concentration that promotes reactions. But even if it that takes too long, each well doesn't need to operate forever.



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