Copernicus Report warns of accelerating ocean warming and rising sea levels

ocean warming sea level rise ocean acidification Copernicus Ocean State Report marine heatwaves

The tenth Copernicus Ocean State Report, produced by Mercator Ocean International, warns of profound and accelerating changes in the world's oceans. Scientists report that the rate of ocean warming has doubled over the last 20 years, with oceans absorbing a record 23 zettajoules of heat last year—approximately 40 times the total energy consumed by humanity in that same period.

Global sea levels are rising at an accelerated pace, increasing from an average of 3.8 millimeters per year since 1999 to 4.2 millimeters per year between 2012 and 2025. Additionally, ocean acidity has increased by approximately 17% since 1985. These shifts are driving extreme marine heatwaves, such as those seen in the Mediterranean and Black Seas in 2024, which lasted over 30 days and reached temperatures up to 4.6 °C above average.

In polar regions, the impact is severe. Arctic surface temperatures rose by 4.2 °C between 1982 and 2024, contributing to a 17% loss in sea ice surface area over 42 years. This melting, combined with permafrost degradation, leaves approximately 60% of Arctic coastal infrastructure vulnerable to erosion and rising seas. The report emphasizes that warming, rising seas, and ecosystem degradation are interconnected signs of long-term, systemic transformation.

Entities

Arctic · Arctic Ocean · Copernicus · Copernicus Marine Service · Copernicus Ocean State Report · European Commission · European Union · Mediterranean Sea · Mercator Ocean International · Pierre Bahurel

Claims

What the coverage asserts, and how many sources carry each claim.

[● 13 SOURCES] Global oceans absorbed approximately 23 zettajoules of energy last year. www.diariodemallorca.es · www.informacion.es · www.lne.es · keyt.com · kioncentralcoast.com · +7 more
[● 20 SOURCES] A study led by the Copernicus platform of the European Commission identifies record ocean warming and accelerating sea-level rise as unequivocal signs of climate change. www.diariodemallorca.es · www.informacion.es · www.lne.es · www.diarioviseu.pt · alltagsmagazin.de · +14 more
[● 13 SOURCES] Ocean warming has accelerated since 1960, reaching a record high in 2025. www.diariodemallorca.es · www.informacion.es · www.lne.es · www.diarioviseu.pt · www.ultimahora.com · +7 more
[● 12 SOURCES] The research involved the participation of 125 scientists worldwide. www.diariodemallorca.es · www.informacion.es · www.lne.es · www.diarioviseu.pt · www.ultimahora.com · +6 more
[● 13 SOURCES] The energy absorbed by the oceans was approximately 40 times the total energy consumed by the world in a single year. www.diariodemallorca.es · www.informacion.es · www.lne.es · keyt.com · kioncentralcoast.com · +7 more
[● 6 SOURCES] Arctic Ocean surface temperatures increased by 4.2 °C between 1982 and 2024. www.upday.com · www.ultimahora.com · www.capital.gr · pelop.gr · www.real.gr · +1 more
[● 8 SOURCES] The rate of ocean warming has doubled over the past 20 years. keyt.com · kioncentralcoast.com · localnews8.com · www.index.hr · www.diarioviseu.pt · +2 more
[● 20 SOURCES] The tenth Copernicus Ocean State Report warns of profound changes including warming, rising seas, and ecosystem degradation. keyt.com · kioncentralcoast.com · localnews8.com · www.diarioviseu.pt · alltagsmagazin.de · +14 more
[● 7 SOURCES] Approximately 60% of Arctic coastal infrastructure is vulnerable to erosion and sea-level rise. www.upday.com · www.ultimahora.com · zpravy.kurzy.cz · pelop.gr · www.real.gr · +2 more
[● 4 SOURCES] Oceans absorb about one-third of the carbon dioxide released into the atmosphere by human activities. anlatilaninotesi.com.tr · www.iklimhaber.org · bosnainfo.ba · prometeo.adnkronos.com
[● 2 SOURCES] Oceans absorb approximately 90% of the excess heat trapped in the Earth system by greenhouse gases. anlatilaninotesi.com.tr · www.iklimhaber.org
[DISPUTED] Global sea levels rose at an average rate of 3.8 millimeters per year between 1993 and 2025. www.elmundo.es · anlatilaninotesi.com.tr · www.iklimhaber.org