I'm reading a lot of James Lileks at the moment, and I just found an interesting word he tried (and failed) to inject into the public consciousness: fearomeme, an idea that spreads quickly because it scares the hell out of everybody.
When one erupts the explosion will be heard around the globe. The sky will darken, black acid rain will fall, and the Earth will be plunged into the equivalent of a nuclear winter. It could push humanity to the brink of extinction.
Before you pack up the family and abandon North America, take a look at the biography of Ian Gurney, the author of the Online Journal piece. He's an "end times" writer and TV producer who never met an apocalypse he didn't like:
He claims to know exactly where Pope John Paul II will die and who his successor will be, and says he can prove that mankind has less than twenty two years left on this planet before Judgement Day.