I was really surprised at how not nihilist it is. I mean it doesn't describe the future due to climate collapse as if it's going to be the same as 20th Century environmental conditions (even those showed the beginning of collapse), but once you accept that things will change, it's a pretty encouraging, if bracing, read.

Sorry, quick side-note, I'd probably put it in the Post/Anti-Civilization, since it mainly deals with how civilization will change (both states and stateless nomadic peoples) due to climate collapse.