The appearance of free oxygen in the Earth’s atmosphere led to the Great Oxidation Event. This was triggered by cyanobacteria producing the oxygen which developed into multicellular forms as early as ...

Today's climate change doesn't hold a candle to the chemical warfare waged on Earth more than 2 billion years ago. Before plants discovered the power of photosynthesis, single-celled life survived on ...

It may have been unexpectedly easy for the air to become rich in oxygen. A new simulation of the rise of oxygen suggests that it was driven by the planet itself, and needed little help from living ...