Great Oxidation Event
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Earth's Ocean Loses 2% of Its Oxygen Since the 1960s, Over 500 'Dead Zones' Reported Worldwide: UNESCO
The UN has attributed the loss of oxygen in Earth’s oceans to human activities. Click to read more.
![Great Oxidation Event 2.5 Billion Years Ago Lasted for Over 200 Million Years, Longer Than Previously Thought [Study]](https://1471793142.rsc.cdn77.org/data/images/full/70831/great-oxidation-event-2-5-billion-years-ago-lasted-for-over-200-million-years-longer-than-previously-thought-study.jpg?w=236&h=132)
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