American geologist Marcia Bjornerud is on a mission to educate us, to the extent we need it, about our planet and the swathes of its four and a half billion years of history. “Timefulness: How Thinking Like a Geologist Can Help Save the World” is a beguiling mix of artful lecturing, personal narrative, and purposeful reflection. The “timefulness” of the book’s title is a term she conjures up to highlight the admixture of ancient and recent geological and related aspects of Earth that are, in her view, the important features we need to consider when saving ourselves from within our new geological era, the Anthropocene. Bjornerud is an elegant, personal writer and this book carries out its mandate fully and to great effect. Read it and learn, friends.