Dumping green sand in shallow seas could let them absorb more CO2

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…