was the biggest mass-extinction event in recent history, with release of toxic gases on a worldwide scale, ash clouds blocking most of the sunlight worldwide for nearly a decade, and a thousand-year mini ice age.
If I remember correctly, Yellowstone is a significantly bigger volcano than Toba. It hasn't gone off in more than 600,000 years. But that's bad news. It's behind schedule.
Today's news: the ground is shifting in the Tetons.