ISBN: 9781260091649 is an International Student Edition of Environmental Science a Study of Interrelationships 15th Edition by Eldon Enger and Bradley F Smith This ISBN 9781260091649 is Textbook only. It will not come with online access code. Connect Online Access code (if required by your instructor ) sold separately at ISBN 9781260134704 The content of of this title on all formats are the same. This full-color, introductory environmental science text is known for being concise, conceptual, and value-priced. The approach and reading level cover the basic concepts without overloading students with too much detail. The authors reinforce the text's central theme of "interrelationships" by providing a historical perspective, information on economic and political realities, discuss the role of different social experiences, and integrate this with the crucial science to describe the natural world and how we affect it.