In 2024, the world experienced unprecedented marine heatwaves, with global sea surface temperatures (SSTs) reaching record highs. This warming trend has continued into 2025, with June 2025 being the third warmest June on record for the global ocean, following 2023 and 2024. The Mediterranean Sea, in particular, was severely impacted, with 62% of its area experiencing record-high-intensity marine heatwaves. These extreme conditions have led to widespread coral bleaching and significant disruptions to marine ecosystems. The primary drivers of these heatwaves include climate change, reduced cloud cover, altered ocean currents, and a strong El NiƱo event. The persistence and intensification of these marine heatwaves underscore the urgent need for global action to mitigate climate change and protect marine biodiversity.
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Record-breaking marine heatwave is intensifying globally
Published July 8, 2026 at 6:52 PM UTC