Scientists warn: Earth’s water is running out of oxygen. And that’s a problem

A UC San Diego study warns that dissolved oxygen is rapidly declining in oceans, rivers, and lakes worldwide.

The drop is being driven by eutrophication, warming water, and changes in circulation.

Researchers say water deoxygenation could be treated as a potential planetary boundary.

The loss of oxygen threatens aquatic species, habitats, and key climate-linked processes such as the carbon cycle.