Ocean: "The average sea level has increased by about 4.2 mm per year since 2012" (Copernicus)

“Around 25% of the top 1,000m of the ocean is now impacted by over two climate change stressors simultaneously (such as warming, salinity changes, deoxygenation, and acidification). The impacts of these trends are far-reaching across marine ecosystems and human society,” stated the authors of the 10^th issue of the annual Copernicus Ocean State Report (OSR), released on 30 September 2026.

Over the past ten years, the OSR has documented the ocean’s natural variability and its profound changes affecting marine environments, biodiversity and societies, providing an authoritative scientific record that supports research, policy, and society.

In this edition, data showed that :
• the sea surface temperature reached its third-highest level on record in 2025, at 0.49°C above the 1981-2010 average …