Why the hazelnut is the most climate-friendly food and why men consume a quarter more electricity than women, illustrates science journalist Mathias Plu¿ss conclusively with facts. A handy environmental encyclopedia with 93 entries that delivers amazing knowledge by putting different aspects of consumer behavior in relation to the environment. Plu¿ss' hopeful thesis is that those who are willing can act immediately and do not have to wait for political measures. The key to reducing the burden on the climate is to do without. However, the implementation is not as simple as the title-giving fact "Less is less" sounds. This practical guide is intended to help by answering everyday ecological questions from A to Z as concretely as possible. Impact points from * to ***** mark the relevance of the problems and indicate where it is actually worthwhile to reduce. 18 illustrations by Till Lauer additionally illustrate the essence of the facts and playfully point out what really matters.