We are all geographers, human beings who care about the places we think of as home—our habitat. And yet, as BBC documentarian Nicholas Crane suggests here, we have lost touch with the connection between our actions and the state of the planet that we all share. We are being confronted by a daily barrage of stories on climate change, population growth, migration, and pollution. Politics aside, these are planetary concerns affecting all people and all places, which can be understood through a greater understanding of geography. In this distillation of a lifetime's work, Nicholas Crane makes the compelling case that knowledge is the best guarantor of the future.