Oceans Face Critical Oxygen Decline, Threatening Ecosystems

WHO:

Gizmodo - Erica Ferrer, lead author and postdoctoral scholar at the University of California, Santa Barbara’s National Center for Ecological Analysis and Synthesis.

Science Daily - Scientists warning about the deoxygenation of Earth's waters.

WHAT:

Gizmodo - A review published in the journal Limnology and Oceanography warns that aquatic deoxygenation is a rapidly escalating, human-driven crisis threatening the biosphere.

Gizmodo - The ocean has lost roughly 2% of its dissolved oxygen since the 1950s and is expected to lose another 1% to 7% by the end of the century.

Gizmodo - The study argues that aquatic deoxygenation should be added to the Planetary Boundaries framework, which identifies nine critical Earth processes.

WHERE:

Gizmodo - The review discusses global aquatic ecosystems, including oceans, lakes, and rivers.

WHEN:

Gizmodo - The review was published on June 30 in the journal Limnology and Oceanography.

Gizmodo - Scientists expect the ocean to lose another 1% to 7% of dissolved oxygen by the end of the century.

WHY:

Gizmodo - The decline in oxygen levels is driven by climate change, nutrient pollution from agriculture and industrial processes, and warming waters that hold less dissolved oxygen.

Gizmodo - The study states that deoxygenation interacts with and modulates other planetary boundary processes, including climate change, nutrient loading, biodiversity loss, and aerosol loading.

HOW:

Gizmodo - The researchers propose four indicators to assess the status of aquatic deoxygenation: dissolved oxygen concentration, proximity to dissolved oxygen capacity, changes in oxygen-sensitive plants and animals, and the Metabolic Index.

(UPDATED July 21, 2026 02:53 UTC)

A new review published in the journal Limnology and Oceanography warns that aquatic deoxygenation is a rapidly escalating, human-driven crisis that threatens the biosphere, with the ocean having already lost about 2% of its dissolved oxygen since the 1950s. Scientists predict that by the end of the century, the ocean could lose an additional 1% to 7% of its oxygen, driven by factors such as climate change and nutrient pollution. The researchers suggest that aquatic deoxygenation should be included in the Planetary Boundaries framework and propose four indicators to assess its status, including dissolved oxygen concentration and changes in oxygen-sensitive plants and animals.