Shelfwear and rubbing to edges and boards. No DJ. Library discard with usual marks and attachments. Pocket removed. Pages tight and clean. 188 pages. HardCover Binding. Year: 1975. ISBN: 067132666x. Despite all the new technology, man is still bound by his natural ecological system, and protecting and restoring our environment has become a major concern. This book presents the dangers to the air, water resources, the land, the forests and fish and wildlife, and the menace of noise, which we must meet. It describes meaningful careers in ecology, engineering, and the life, physical and environmental sciences which will help make our world a better place to live in.