Just how much carbon was injected into the atmosphere during the Paleocene-Eocene Thermal Maximum, or PETM, as scientists now call the fever period, is uncertain. But they estimate it was roughly ...

The event is known as the Palaeocene-Eocene Thermal Maximum (PETM) but the cause of the warming is still debated. Huge amounts of carbon entered into the atmosphere at the time along with methane.

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