About 2.3 to 2.5 billion years ago, in what is called the Great Oxidation Event, blue/green algae began emitting enough oxygen, through photosynthesis, to permanently oxygenate the atmosphere that keeps us alive today. New research led by Imperial College London suggests that the production of oxygen started about 1 billion years earlier before then.
Science in a Minute 112918 Earth's Oxygen Production May Have Started a Billion Years Earlier Than Thought 1343986
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