This is a remarkable book with lucid, approachable geological science. It’s written in a way that shows the author’s passion for geology and for teaching. She also folds in memorable vignettes about the lives of figures whose discoveries paved the way to what we know now about climate science. This is a very, very good read, and equally thought-provoking. It methodically builds a case that the Earth’s climate is more unstable than we knew: it can – and has, in historical eras – drastically changed in less than a lifetime.