Just a reminder that the threat is gathering :

Hidden deep beneath the Earth’s surface lie one of the most destructive and yet least-understood natural phenomena in the world – supervolcanoes. Only a handful exist in the world but when one erupts it will be unlike any volcano we have ever witnessed. The explosion will be heard around the world. The sky will darken, black rain will fall, and the Earth will be plunged into the equivalent of a nuclear winter….
It is little known that lying underneath one of America’s areas of outstanding natural beauty – Yellowstone Park – is one of the largest supervolcanoes in the world. Scientists have revealed that it has been on a regular eruption cycle of 600,000 years. The last eruption was 640,000 years ago… so the next is overdue.