Permian–Triassic extinction event - Marine Life

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night_wrtr

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We Finally Know What Killed Sea Life in The Deadliest Mass Extinction in History

Now scientists have demonstrated what obliterated the marine life: rising temperatures accelerated the metabolisms of ocean creatures, which increases their oxygen requirements, while simultaneously depleting the oceans of oxygen.

The animals literally suffocated.
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The article says it took a few thousand years to increase the temperature. Current temperature rises could be at 50% of the Permian warming in the year 2300.
 
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