The Chesapeake Bay saw oxygen levels hit record lows this summer. That’s according to the hypoxia measurement, which is performed twice a month. Hypoxia happens when water has less than 2 mg/l of ...

DENTON, Texas — Denton officials said a drop in oxygen killed fish in Unicorn Lake. Saturday, Denton's environmental services team assessed the dead fish at Unicorn Lake and determined the cause was ...

For now, complex life flourishes on our planet thanks to its supply of oxygen. But Earth's atmosphere wasn't always like it is today, and scientists predict that in the future, it will revert back to ...

Some 390 million years ago in the ancient ocean, marine animals began colonizing depths previously uninhabited. New research indicates this underwater migration occurred in response to a permanent ...