Synopsis For the first time in his entire cultural history, man is facing one of the most horrible ecological crisis--the problem of pollution of this environment which sometime in the past was pure, virgin, undisturbed, uncontaminated and basically quite hospitable for him. This book is intended for use in a course of undergraduate and postgraduate of environment science, ecology and pollution. The vocabulary and level of discussion have been kept simple and non-technical so as to be accessible to students with little or no science background. At the same time, enough data and depth are presented to make this book suitable for higher classes and as a valuable resource for all students who will keep it in their personal libraries after their formal studies are completed.