The worst mass extinction in Earth’s history, 250 million years ago, was triggered by extreme El Niño events and volcanic eruptions in Siberia. These eruptions released vast amounts of carbon dioxide into the atmosphere, causing severe climate changes. The warming environment led to the death of 90% of species on land and in the oceans. While this event occurred mill… science The worst mass extinction in Earth’s history, 250 million years ago, was triggered by extreme El Niño events and volcanic eruptions in Siberia. These eruptions released vast amounts of carbon dioxide into the atmosphere, causing severe climate changes. The warming environment led to the death of 90% of species on land and in the oceans. While this event occurred mill…