The extreme imbalance in the Earth system that caused the mass extinction of the Paleocene-Eocene boundary was from the dramatic influx of which greenhouse gas?

Question

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The mass extinction at the Paleocene-Eocene boundary, also known as the Paleocene-Eocene Thermal Maximum (PETM), was primarily caused by a dramatic influx of methane. This event led to a significant increase in global temperatures and had profound effects on the Earth's climate and ecosystems. Methane is a potent greenhouse gas, and its release into the atmosphere can lead to rapid warming.

The Extreme Imbalance in the Earth System That Caused the Mass