How are oceans faring in a heating world? DW 06/10/2025
Briefly

The UN Ocean Conference in Nice, France, addresses urgent concerns about the health of the world's oceans, which support more than 250,000 species and provide essential nutrition to over a billion people. With rising ocean temperatures causing widespread coral bleaching and diminishing oxygen levels, underwater life faces peril. Overfishing exacerbates the crisis, with many fish populations suffering severe depletion, particularly in the Mediterranean. The implications for biodiversity and food security are profound as these ecosystems teeter on the brink of collapse.
"With anything higher than 2 C, destruction would be inevitable," says Katja Matthes, director of the GEOMAR Helmholtz Center for Ocean Research Kiel in Germany.
"Warm water also absorbs less oxygen and that puts many more underwater creatures at risk. We see death zones here in Germany's Baltic Sea where life is virtually unable to exist anymore," Matthes said.
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