A rapid temperature increases about 55 million years ago created tropical conditions around the world, these conditions causes adaptive radiation of Euprimates.
The Paleocene-Eocene thermal maximum (PETM), also known as "Eocene thermal maximum 1" (ETM1), was a period of time when the global average temperature of tropical conditions increased by more than 5-8 °C during the event. It was formerly known as the "Initial Eocene" or "Late Paleocene" thermal maximum. The linked period of major carbon emissions into the atmosphere was estimated to have lasted between 20,000 and 50,000 years. The entire warm era lasted for about 200,000 years. The earth's surface warmed up by 5-8 °C.
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