Scientists warn of declining oxygen levels in oceans and rivers
Scientists warn of declining oxygen levels in oceans and rivers
Updated at: July 21, 2026 at 01:45 AM
A quiet crisis is unfolding beneath the surface of our waters.
Known as aquatic deoxygenation, the decline of dissolved oxygen levels in oceans, rivers, and lakes has become a critical environmental threat.
Since 1960, oceans have lost roughly 2% of their oxygen, while some lakes have seen declines as high as 18%.
This loss creates 'dead zones' where aquatic life cannot survive.
Two main factors drive this disaster: global warming and nutrient pollution.
Rising temperatures cause water to hold less oxygen and prevent natural mixing, while agricultural runoff triggers massive algal blooms that consume oxygen as they decompose.
As oxygen levels drop, biodiversity suffers.
Addressing this requires urgent action, including reducing greenhouse gas emissions and controlling nutrient runoff.
