Olivine sands can be found on some beaches in Hawaii

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Dumping alkaline green sand into shallow seas could increase ocean absorption of carbon dioxide by 8 per cent this century, according to a modelling study.

Oceans take up almost a third of the CO2 we emit into the atmosphere and researchers are exploring ways to boost that amount. Dissolving 1 gigatonne a year of ground-up olivine, a common, greenish mineral made mainly of magnesium, iron, silicon and oxygen, in shallow seas could reduce atmospheric CO2

levels by 10…

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