About 250 million years ago, the world suffered through an extinction event that makes the death of the dinosaurs look like a minor hiccup by comparison. And now we have our best understanding yet of what caused the Great Dying.
250 million years ago, roughly 95% of the species on Earth went extinct in what's often called "the great dying." Megavolcanoes in Siberia were partly to blame. But what caused those volcanoes to erupt so powerfully, for centuries on end?