Ocean oxygen content drops
Ocean oxygen content drops
Oxygen content in sea water is dropping rapidly over the last 50 years. So-called “Dead Zones”, regions where there is no oxygen and hence no life, have increased four-fold in the open ocean, and even ten-fold in coastal waters. Fish have moved away from these zones to other areas, where they might be prone to predators or fishing activities. The major cause of Death Zone formation is global warming, as warm water can contain less oxygen than cold water, and warmer surface water makes it more difficult for oxygen to reach deeper waters. Scientists expect more Death Zones to form with continuing global warming.

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Scientific publication: Declining oxygen in the global ocean and coastal waters