Researchers have begun to solve the mystery of how COVID-19 causes "silent hypoxia," where oxygen levels in patients become abnormally—and dangerously—low.

Some marine animals may tolerate warming seas—but climate change could make it harder for many to find "breathable" places to live, a new study shows.

The success rate for climbers reaching the summit of Mount Everest has doubled in the past 30 years while the death rate has hovered unchanged at around 1%.

"...an evolution of the mantle of the Earth could control an evolution of the atmosphere of the Earth, and possibly an evolution of life."

A new study shows ocean breathability is key for ocean animals. Climate change may make habitats unbreathable by 2100, researchers warn.

Early Earth 3.2 billion years ago was a world of vast oceans and submerged continents. The new findings could have implications for the origins of life.

New research shows how low oxygen levels in the heart can result in life-threatening arrhythmias, or disorganized heart rhythms.

Scientists braved the heat to answer a question about oxygen and "Snowball Earth," a period when the oceans virtually froze from the poles to the equator.

A new theory involving volcanoes may partly explain the appearance of the first oxygen on Earth 2.5 billion years ago, researchers say.

Scientists had thought that a lack of oxygen in Earth's oceans may have led to the world's best preserved fossils. New research suggests that's not true.