1. Coal burning in Siberia triggered by volcanic eruptions led to Earth's most severe extinction  Daily Mail
  2. Massive Coal Burning Linked to 'Great Dying': The Worst Extinction in Earth's History  ScienceAlert
  3. Coal-Burning in Siberia 250 Million Years Ago Led to Climate Change & Caused the Earth’s Most Severe Extinction Event  SciTechDaily
  4. Coal May Have Significantly Driven the Great Dying That Wiped Out Life on Earth, Scientists Say  Sputnik International
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