I finished this book with very mixed feelings... On the one hand, it's an interesting premise, and generally I felt like it was a well researched attempt to answer the question of what would happen to the world if humans were to suddenly disappear. There were a lot of fascinating pieces of information, quotes from experts, and other ways to show how each aspect of our world would age and change in the absence of humans, and I thoroughly enjoyed these. My main complaint for the length of the book was that it felt very disjointed, bouncing from one aspect to the next without a lot of transition, such that I felt more like I was reading a long series of essays than a book. There were also a few pseudo-mystical parts that were frustrating, especially at the end. Overall, I'm still glad I read it though.