Scripps Scientists Warn Earth’s Waters Lost 2% Oxygen Since the 1950s, Pushing Planet Toward Unsafe Space
Updated
Updated · ScienceDaily · Jul 20
Scripps Scientists Warn Earth’s Waters Lost 2% Oxygen Since the 1950s, Pushing Planet Toward Unsafe Space
3 articles · Updated · ScienceDaily · Jul 20
Summary
A new Scripps-led review says oxygen is disappearing rapidly from oceans, lakes, rivers and coastal waters, with losses severe enough to push Earth toward an “unsafe space.”
About 2% of ocean dissolved oxygen has already been lost since the 1950s, and the study ties the decline to human-driven warming, nutrient pollution and shifts in deep-water circulation.
Falling oxygen threatens aquatic food webs from microbes to fish and sharks, while also weakening biological and chemical processes that help regulate Earth’s climate; some changes could last centuries.
The researchers argue aquatic deoxygenation should be added to the 9-boundary Planetary Boundaries framework so policymakers assess it alongside climate change, biodiversity loss, ocean acidification and pollution.
Scientists propose a new 'planetary boundary' for oxygen loss. Is it too late to save our oceans?
With seven planetary boundaries now crossed, is Earth's 'safe space' already a thing of the past?
As our waters lose oxygen, what are the hidden health risks lurking beneath the surface for us?
Aquatic Deoxygenation: The Case for Recognizing a 10th Planetary Boundary and the Urgent Need for Global Action
Overview
Aquatic deoxygenation—the rapid loss of oxygen in oceans, lakes, rivers, and coastal waters—is accelerating and pushing Earth into a dangerous state. Scientific observations show a severe drop in dissolved oxygen, with a fourfold increase in ocean oxygen loss already underway. As oxygen levels plummet, essential microbes and many aquatic organisms suffocate and die, leading to widespread mortality. This dramatic reduction disrupts the balance of aquatic food webs and ecosystem functions, threatening biodiversity and the services these ecosystems provide. The crisis highlights the urgent need to recognize aquatic deoxygenation as a critical planetary boundary.