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flag Global ocean temperatures hit record highs in 2025 despite La Niña, driving marine heatwaves, ecosystem damage, and economic losses.

flag In 2025, global ocean temperatures hit record highs despite a cooling La Niña phase, with ocean heat content rising by 23 zettajoules—equivalent to 200 times global electricity use in 2024. flag Nearly 90% of climate-driven excess heat is absorbed by oceans, accelerating marine heatwaves, coral bleaching, and ecosystem collapse. flag Sea surface temperatures around South Korea reached near-record levels, with warming more than double the global average, contributing to sharp declines in fishery output and aquaculture losses. flag Ocean degradation now nearly doubles the global economic cost of carbon emissions, with scientists urging policymakers to account for the "blue cost" of climate change, including vital ecosystem services.

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