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.
We have a longer list in the topic of #anarchism on the Discord that includes those. I just used libgen to fill in things because it was easier to find nicely formatted ebooks at the beginning, and other contributors followed that lead. The generated ones on AL are fine, but I'm also way more familiar with navigating libgen.