Earth’s Oceans Are Rapidly Losing Oxygen. It Could Destabilize the Planet - Gizmodo

What the report says

Gizmodo reported that scientists are urging greater attention to the loss of dissolved oxygen in oceans, lakes, rivers and other aquatic ecosystems, describing it as a fast-growing, human-driven threat. The article, published July 20, 2026, cites a review paper published June 30 in Limnology and Oceanography that argues aquatic deoxygenation should be considered for inclusion in the Planetary Boundaries framework, a scientific model used to assess pressures on Earth systems.

According to Gizmodo, lead author Erica Ferrer, a postdoctoral scholar at the University of California, Santa Barbara’s National Center for Ecological Analysis and Synthesis, said aquatic ecosystem stability depends on oxygen and that deoxygenation interacts with other global environmental risks. The report explains that organisms rely on dissolved oxygen gas in water, not the oxygen chemically bound in H2O. Warmer waters hold less dissolved oxygen, and warming can also reduce mixing between surface and deeper layers.

The article also points to nutrient pollution from agriculture, wastewater, runoff and industrial activity as a major contributor. Excess nitrogen and phosphorus can spur algal blooms, whose decay consumes oxygen; warming and microbial activity can intensify the effect. Gizmodo cites Copernicus, the European Union Earth observation and monitoring program, for the estimate that the global ocean has lost about 2% of dissolved oxygen since the 1950s and could lose an additional 1% to 7% by century’s end.

The review’s authors propose potential indicators for tracking the problem, including dissolved oxygen levels, oxygen capacity, shifts in oxygen-sensitive species and the Metabolic Index, which compares organisms’ oxygen needs with what is available. The issue matters because low-oxygen conditions can disrupt food webs, biodiversity and climate-linked feedbacks, while the policy implications remain uncertain.