New research released in the Copernicus ocean state report documents unprecedented thermal absorption by the world’s oceans, with 23 zettajoules of heat—roughly 40 times annual global energy consumption—absorbed into marine waters. The oceans have become significantly warmer and higher, with sea levels rising at an accelerating pace of approximately 4.2 millimeters annually between 2012 and 2025, compared to 3.8 millimeters yearly since 1999. The global ocean has experienced a 17% increase in acidity over the past four decades.
Ocean systems have sequestered approximately one-third of human carbon dioxide emissions and roughly 90% of excess heat trapped by greenhouse gas pollution. According to Pierre Bahurel, director general of Mercator Ocean International, these changes represent interconnected signs of significant long-term transformation affecting marine environments worldwide.
Regional impacts have been particularly acute in European waters, which are warming at twice the global average rate. The Mediterranean and Black Seas have experienced record-breaking marine heatwaves with elevated temperatures persisting well below the surface, some lasting over a month. The Mediterranean has warmed by 0.32 degrees Celsius per decade, with scientists documenting an acceleration of sea level rise in its western regions.
The environmental damage to marine life has been extensive. Between January 2023 and September 2025, 84% of global coral reefs experienced bleaching-level heat stress. Nearly 5% of ocean areas have experienced persistent shifts in phytoplankton growth patterns over three decades, potentially affecting food webs and carbon regulation. In Antarctic regions, four emperor penguin colonies experienced complete breeding failures in 2022 during periods of record-low sea ice.
Related research identified a concurrent public health challenge, with more than one-third of humanity exposed to dangerous ground-level ozone pollution during the year. The phenomenon, termed the “ozone-climate penalty,” results from chemical interactions between pollutants, heat, and sunlight. In the first eight months of 2026, only 5% of the global population experienced ozone levels meeting World Health Organization guidelines.
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