The ocean as a limestone dump

Here’s a solution to the problem of ocean acidification: dump in a bunch of limestone to neutralize it. Evidently it works, according to Danny Harvey at the University of Toronto.

You’d have to dump in quite a lot, though. Try 4 billion tons. Per year. Over decades.

Even assuming its ecological side effects are relatively benign (a big"if"), the scheme has little chance of being implemented, says KenCaldeira of Stanford University’s Carnegie Institution, who describedHarvey’s plan as "unrealistic" and a mere "theoretical possibility."

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