This book, the result of the author's experience in psychology and forestry studies, studies the relation between these two seemingly different disciplines. The author indicates how human actions and programs affect a range of threatened or endangered situations ranging from forests and species of animals to our own traditional values and cultural groups. Sustainers, the persons who advocate and support sustainability, possess or must come to possess certain characteristics that are shown to be renunciation, knowledge, attitude, controllability, and patterning. This book seeks to discover and advocates how and why those attributes must be strengthened if we are to sustain our environment and ourselves.