This has absolutely nothing to do with just about anything I usually write about.
But I was watching this show recently about what would happen in the extremely unlikely event that something made humans but no other species go extinct. (They did not get into the near-impossibility of this scenario.) At first it was really depressing, but then they were showing how once all the cities were overgrown, housecats would take over living in the ruins off of all the small animals and birds that were now living there. (And they showed how cats already do that in some ruins.)
I know it sounds strange, but I could deal with the concept of extinction of the human race a lot better if I knew the cats were going to take over. I know that’s unlikely to happen — anything that would affect humans so drastically would affect other species as well — but if cats survive it seems less depressing.