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flag A 2026 Gulf of Maine trial safely boosted ocean alkalinity with sodium hydroxide, removing 10 tonnes of CO₂, but long-term effects remain unknown.

flag A small-scale 2026 trial in the Gulf of Maine successfully increased ocean alkalinity using sodium hydroxide, removing up to 10 tonnes of CO₂ by enhancing natural carbon absorption. flag No immediate harm to marine life was detected during short-term monitoring, suggesting potential safety at a local level. flag However, the experiment was not designed to assess long-term ecological effects, scalability, or carbon storage permanence. flag Scientists caution that impacts on plankton, nutrient cycles, and ecosystems remain uncertain, emphasizing the need for larger, longer-term studies and international oversight before considering broader use. flag The method is not a substitute for emissions reductions but may be one tool in climate mitigation.

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