The hyperthermals took place roughly every 400,000 years during a warm period of Earth's history that prevailed some 50 million years ago. The strongest of them coincided with an event known as the Paleocene–Eocene Thermal Maximum, the transition between two geologic epochs in which global temperatures rose between 4 and 7 °C and needed 200,000 years to return to historical norms. The events stopped
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