Ancient oceans stayed oxygen rich despite extreme warming

6 days ago 16

The Arabian Sea contained more oxygen about 16 million years ago than it does today, even though Earth's climate was warmer at the time.
Powerful monsoons, shifting ocean currents, and connections between seas strongly influence oxygen levels, showing that ocean health depends on more than temperature alone.
Over very long timescales, oxygen levels in the oceans could increase again, although what that would mean for marine life remains uncertai...