The History Channel...has been running a popular series on so-called mega-disasters that threaten to do serious damage to life on earth. From super volcanoes to super asteroids, to exotic space phenomena and more mundane, down-to-earth threats, we count down the top ten mega disasters and tell you which ones to worry about. Number 10: Global Warming No phenomenon in recent memory has been more over-hyped than global warming... Number 9: Pole Shift Pole shift is so far “out there” as a credible disaster scenario that it just barely straddles the line between science fiction and science. The fact that we...