James Lovelock’s hypothesis, that the Earth is a living organism, has changed people’s view of the world. This book addresses planetary health, the diagnosis of its sickness, prognosis for recovery and prescriptions for treatment. Is the ozone layer an early warning symptom of a planetary illness? Is the human race a multiplying disease organism? Is the illness fatal? Can it be treated? These are some of the questions posed in this book by the originator of the Gaia hypothesis.