Oceans are already oxygen-starved in places: every summer some areas of the northeastern Pacific see huge numbers of dead fish, shrimp or molluscs washed up on beaches. This is caused by marine animals suffocating because the water contains too little of the vital O2 they need to breathe – or none at all. It is not only an ecological problem, the local fishing industry is affected as well. Currently around 15 per cent of oceans are considered oxygen-depleted or anoxic “dead zones”.
Oceans could run out of oxygen, Swiss co-authored study warns - swissinfo
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