During the last twenty years, more attention has steadily been devoted to the significance of human activity upon the environment. This book identifies ways in which human activity has affected environmental processes. Each chapter examines a particular aspect of environmental processes showing how they have been affected and then gives a brief indication of the significance for the management of the environment. The chapters are organized by the major spheres which make up the Earth's environment under the headings atmosphere, hydrosphere, geosphere, pedosphere and biosphere. The introductory chapter looks at the way in which investigations have been carried out and the concluding chapter relates such investigations to management at both the national and international level.