More shockwave events to worry about, in addition to peak oil and global warming

Summary:  about shockwaves, the various catastrophic threats to civilization -- even to life on Earth.  There are so many, often with believers who warn that this threat deserves the most drastic action.  At the end is a recommendation, a better way to prepare. Shockwaves:  low probability but high impact events.  Difficult to predict when they … Continue reading More shockwave events to worry about, in addition to peak oil and global warming