It started off right. The author claimed he was going to explore changes in Europe the last time we experienced rapid climate change. But he quickly went sideways with a lot of talk about philosophy & religion only tangentially related to the change in climate. To simplify only a little, he essentially says this happened and that happened and that happened, and BTW it might be related to climate change.
I finished the book because I was listening to the audio book while I was planting trees and had nothing else to do. I think doubt I would have finished otherwise. In other words, if you’ve got nothing better to do, read this book, but I cannot generally recommend it.