Authored by James Rickards via DailyReckoning.com,

I've covered a wide variety of potential crises over the years.

These include natural disasters, pandemics, social unrest and financial collapse. That's a daunting list.

One thing I haven't done is to cover the greatest potential calamity of all — nuclear war. For the reasons explained below, now is the time to consider it.

Nuclear warfighting is back in the air. The subject is receiving more attention today than at any time since the Cuban Missile Crisis of 1962 and its aftermath. There are three reasons for this.