The “Natural Problem of Consciousness” is the problem of understanding why there are presently conscious beings at all. Given a non-reductive naturalist framework taking consciousness as an ontologically subjective biological phenomenon, how can we rationally explain the fact that the actual world has turned out to be one where there are presently living beings that can feel, rather than having developed as a zombie-world in which there would be no conscious experiences of any kind? This book introduces the Natural Problem by relating it to central problems in the philosophy of mind...