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Jan Steinman's avatar

This isn’t quite true.

It was not a “single species”, but the proliferation of cyanobacteria ushered in the Great Oxygenation Catastrophe, which extinguished some 90% of all species.

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Glenn Toddun's avatar

Sources please. There are some pretty bold claims here, ones I am likely to believe, but it would be good to read the studies to get a broader view.

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