Over the past 50 years, the world's population has doubled, food production has tripled, and energy consumption has quadrupled. This provoked climate problems, most of which are irreversible. Geochemist, professor at the University of Oslo, and best-selling author of The Girl in the Lab, Hope Jaren, did the research, and the result is this clear and honest book. Based on statistics, figures and facts, the author explains how humanity has changed the Earth. There are no frightening forecasts, theories about the end of the world, reproaches and criticism. Only clear and reasonable advice on how to learn to spend less and share more. A book for those who want to learn as much as possible about environmental issues, but are tired of popular myths, horror stories and meaningless discussions.