It is really, really scary to think about how our entire infrastructure is so incredibly fragile, and how its maintenance is pretty much dependent on a non-renewable resource. Also how quickly we've gotten away from being able to fit our basic needs through our own initiative (if the apocalypse happens tomorrow, I'm pretty much screwed). We're living in such a delicate state, and there are so many things that can go wrong. It's overwhelming.

Then again, there are plenty of other things that can screw us over. We've not divorced from the planet as a whole; nature can still wipe us out. We have no guarantees that Yellowstone isn't going to blow its top in the future, and there's not a whole lot we can do about it.

Or, y'know, the Vulcans might show up and save us all. That'd be awesome. ;)