When plotted against time, human population is best represented by a J curve, an otherwise orderly line which takes a sudden leap upward. If bacterial counts in a baby followed a J curve, it would cause despair. If the population of fruit flies in an experiment jar follows a J curve, that population soon collapses. The nature of the Earth-human relationship now places humans (who are at the top of the intelligence chain), in a unique position : we have become responsible for the course of all life’s existence through all of deep-time. This book is about this Earth–human relationship, with a focus on gratitude, service, and responsibility. It uses published and internet sources interwoven with the author’s own voice to reveal the importance of population care.