Climate change caused the “Great Dying,” aka the planet’s worst extinction

The “Great Dying” was just as bad as it sounds. In the planet’s worst mass extinction 252 million years ago, up to 80 percent of all species died out, including up to 96 percent of ocean species. Trilobites, sea scorpions, and spiny sharks disappeared forever. The rapid reorganization of life on Earth spawned all kinds of unimaginably nasty things, like a giant burp of toxic hydrogen sulfide in the atmosphere released from decaying marine animals.

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