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Thanks for explaining this! From the title alone, I thought the proposal was going to be a way to speed up ocean acidification under the guess that its negative consequences are less bad than the negative consequences of atmospheric carbon. I’m glad to see that some of these proposals actually effectively work in the other direction, by finding ways to alkalinize the ocean, so that it sucks carbon out of the air faster.

Of course, the same questions apply to all of them - is the thing we are proposing actually less bad than leaving the carbon in the atmosphere, or omitting the human activity that would emit the carbon?

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White Sands national park is pretty much all gypsum. Easily dissolved in seawater. No grinding necessary. Heck, the entire Chihuahuan desert could work.

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