Experts attribute the record largely to long-term human-caused warming from greenhouse gas emissions, amplified by the current El Niño event in the tropical Pacific.

Beyond immediate weather, heat stress is harming marine ecosystems like coral reefs and seagrass meadows, disrupting ocean food chains and impacting fisheries and aquaculture.

Leaders are calling for rapid policy action to cut fossil fuel emissions and implement concrete conservation measures, stressing that protecting at least 30% of the planet by 2030 requires practical on-the-ground commitment and support for Indigenous peoples and local communities.

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The observations are reported across multiple outlets, including The Guardian on record surface temperatures, The Washington Post on Holocene-era implications, NOAA on marine heatwaves, and The Independent on ecological and food-security impacts.

The world's oceans reached a record high sea surface temperature of 21.1°C (70°F) on a recent Friday and Saturday, according to Copernicus, with expectations that it will rise further in the coming months.

Officials and advocates urge accelerated investment in clean ocean energy, such as offshore wind, and stronger protection of marine and coastal ecosystems to mitigate impacts and sustain fisheries.

Copernicus emphasizes the broader climate impact of the record and urges attention to regional consequences, with explanatory context and potential impacts illustrated in a video accompanying the article.

Overall, the record underscores ongoing climate change impacts on the marine environment and the risks this poses to coastal communities and ecosystems.

The piece includes a call to support science journalism, highlighting Scientific American's role in reporting on climate-related discoveries and issues.

Source information notes the article draws from Pravda.Ru, with Anton Kulikov serving as the English edition's news correspondent.

Scientists warn these changes could have ecological and economic consequences, including threats to global food security and livelihoods tied to fisheries.