The scary part is that we may have another civil war within the next few decades.
The spooky part is that, 500 years from now, historians will be talking about it as a continuation of the first one.
What makes you think the human race will still be around in 500 years?
I figure the odds are high, given that we've made it this far. What do you see as the major threat? Nukes? A pandemic? Asteroid?