The book is almost completely rewritten in comparison to the previous edition, with a more logical organization of the chapters. The fundamentals of thermodynamics, radiation, fluid dynamics and chemistry are introduced in the first six chapters including a new chapter on remote sensing. Also there is an additional chapter on Geoengineering. A significant addition to the new edition, at the end of each chapter, are the Examples where thetopics introduced in the chapter are further discussed with application to classical problems or new research items. Many of these examples are accompanied by computer programs. The most important update deals with the theory of the general circulation, the methods to evaluate GCM, the detailed discussion of the urban troposphere and the chaos and non linear phenomena.