When you think of ancient mass extinctions, you probably think of the asteroid that killed the dinosaurs. That's fair: The KT extinction event, as it's called, decimated around 80 percent of all species on Earth about 66 million years ago. You might even think about the extinction event known as the Permian extinction, or "the Great Dying," which took place around 250 million years ago — before dinosaurs existed — and is recognized as the largest mass extinction event in our planet's history. If you measure by the number of species affected, that's true. But if you measure by the sheer quantity of life lost? Well, you'd have to go back a couple billion years. Nothing compares to the Great Oxygenation Event.
The Great Big, Itty-Bitty Apocalypse
Drowning in Oxygen
Written by Ashley Hamer September 25, 2019
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