I thought this was pretty realistic portrayal of how some sort of global winter may play out. The sun is blocked by dust or debris or whatever, plant life dies,

I thought this was pretty realistic portrayal of how some sort of global winter may play out. The sun is blocked by dust or debris or whatever, plant life dies, the rest of the biosphere dies, and all that's left is some humans who scavenge and end up eating each other. I guess rotting plant matter like trees might provide nutrients for some sort of meager ecosystem composed of fungi and insects for quite some time. Maybe a few small mammals and birds. The book didn't really touch on that, though.