I dreamt that J and I were camping up in the Colorado mountains when we stumbled over a totally secret military bunker-like facility. At first we were trying to get in and they wouldn't let us (of course) but then the gates opened and we were admitted. Inside, we discovered that the US government had successfully initiated a program to communicate through time, and that they'd been contacted by their future selves. Apparently, an asteroid was approaching the Earth-- no, bigger than a asteroid, it was a small moon. There was no way to stop it, and the shock of impact was going to strip the entire planet of life-- except for this region of Colorado, which would survive because of some weird kind of interference patterns in the impact waves through the Earth. So the gov't had built this bunker and all the rich and powerful people were stocking up and getting ready for the impact, which was mere hours away. They had let us in at the last minute because we just happened to be right there.
So we prepared for the impact by watching photos sent from the future, from a moon base apparently-- the Earth's entire Eastern hemisphere was a crater, and it was all brown and covered in smoke. And then the asteroid struck us and the world was torn apart around us.