Yeah, the world the book creates I felt was more about a feeling than any logical result of some calamity. I'm not sure why humans would survive when pretty much every other creature/plant has died out, but the way the book is written, it didn't matter and I accepted the world. If they try to explain too much, I worry the story will lose some of its power.

But overall, good trailer, me thinks. Not sure I want to revisit that story quite yet, but looks like it could be a good adaptation.