Fluid Mechanics and Thermodynamics of Our Environment provides an introduction to the mechanical and thermodynamic properties of the environment. The book begins with a discussion of the nature of the physical environment, namely the earth, the atmosphere, and the oceans. It then reviews the origin, definitions, and physical characteristics and relations of concepts affecting the state of the geofluid system. Separate chapters cover the principles of heat transfer; factors affecting the mechanical and thermal equilibrium of the environment; the phenomenon of surface tension; kinematics and dynamics of the environment; inviscid motion of the atmospheric and oceanic free layers; and the physical and mathematical behavior of the planetary boundary layer. The final chapter discusses some applied problems pertaining to the environment. These include problems involving the thermal plume, hurricanes, and the dynamic response of a balloon in a vortical atmospheric column. This book was developed for engineering classes interested in the motion of the environment which is a main carrier of pollutants. The selection of topics and the emphasis make the material primarily suited for engineering work.