Summary:
- The article discusses an early mass extinction event that occurred around 252 million years ago, known as the Permian-Triassic extinction or the "Great Dying."
- This event was triggered by a series of volcanic eruptions in Siberia, which released vast amounts of greenhouse gases into the atmosphere, leading to global warming and ocean acidification.
- The article explains how this event wiped out over 90% of all marine species and around 70% of all land-based species, making it the most severe mass extinction event in Earth's history.