The world may very well end during our lifetime, at least as we know it. Remember, humanity is insane enough to have invented the weapons to achieve the effect.
All I know is I have no control over the end of the world, so I don't bother thinking much about it. Be good to yourself, be good to others, be open minded, cheer for The Red Sox, realize you probably don't know the answers, eat Mexican food weekly, and the rest will take care of itself. That's my philosophy, and I'm still trying to perfect it.