The world's oceans are losing oxygen—and rapidly. The principal cause is the increasing warming of the oceans, which reduces the solubility of oxygen in water and increases respiratory activity. In addition, it strengthens stratification of the water column, making it harder for deep and surface water to mix.

The world’s oceans are losing oxygen—and rapidly. The principal cause is the increasing warming of the oceans, which reduces the solubility of oxygen in water and increases respiratory activity. In addition, it strengthens stratification of the water column, making it harder for deep and surface water to mix.

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