Ocean geoengineering trial finds no evidence of harm to marine life

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Pouring 65,000 litres of sodium hydroxide into the Gulf of Maine removed up to 10 tonnes of carbon dioxide from the atmosphere without harming wildlife, according to the researchers behind an ocean alkalinity enhancement test Can we safely remove carbon dioxide from the atmosphere by counteracting ocean acidification? Maybe, suggests a trial in which ships poured 65,000 litres of alkaline sodium hydroxide into the Gulf of Maine off the East Coast of the US in August 2025. “We’re the first group to do a ship-based alkalinity enhancement experiment,” says Adam Subhas at the Woods Hole Oceanographic Institution in Massachusetts, whose team announced their initial findings at the Ocean Sciences Meeting in Glasgow, UK, on 25 February. “We can definitely say that there was additional CO2 uptake as a result of this experiment.” Between 2 and 10 tonnes
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