The Copernicus Ocean State Report 9 (OSR9), published on September 30, 2025, offers a comprehensive analysis of the global ocean's state, focusing on the years 2023 and 2024. Compiled by over 100 international experts and led by the Copernicus Marine Service, this report underscores the profound impacts of the "triple planetary crisis"—climate change, biodiversity loss, and pollution—on marine ecosystems and human societies.
Key findings:
Ocean warming:
Global sea surface temperatures hit a historic 21°C in spring 2024.
The northeastern Atlantic warmed at +0.27°C per decade since 1982, roughly double the global average.
Marine heatwaves in 2023–2024 exceeded previous records by 0.25°C.
Marine ecosystem stress:
>8% of biodiversity hotspots are at risk, including coral reefs.
Ocean acidification increased 30% since 1985, affecting calcifying organisms.
Plastic pollution is now pervasive across all ocean basins.
Societal and economic impacts:
Coastal communities and fisheries face declining resources.
Economic losses affect fishing and tourism sectors.
Monitoring and policy insights:
Advanced satellite and in-situ data, combined with modeling, provide a holistic view of ocean health.
Urgent action is needed to guide sustainable ocean management and protect both ecosystems and human livelihoods.
