Hypoxia

The vicious cycle created by high seawater temperatures, deoxygenation and pollution has driven the Marmara Sea into a state of "coma," according to research led by the Middle East Technical University's (ODTÜ) Institute of Marine Sciences.

Millions of dead and rotting fish have clogged a vast stretch of river near a remote town in the Australian outback as a searing heatwave sweeps through the region.

Videos posted to social media showed boats ploughing through a blanket of dead fish smothering the water, with the surface barely visible underneath.

The tragic scene took place at the Kriti Hospital, a private clinic near New Delhi, last week after the families of the patients were told that the hospital was running out of oxygen, "Blic" writes.

Researchers at Tel Aviv University suggest that Europe’s Paleolithic artists may have experienced hypoxia or lack of oxygen