Known for its currency and readability, this book focuses on enabling readers to critically evaluate the latest environmental issues and to apply that understanding to situations and events in their everyday lives. It explores the interactions of humans within the natural environment and probes issues thoroughly examining their scientific basis, their history, and society's response. The authors discuss sustainable development and public policy in terms of how they shape the present and future. Topics covered include ecosystems and how they work; the human population; renewable resources; energy; pollution and prevention; and more. For anyone interested in environmental science, environmental studies, and environmental biology.
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Richard T. Wright is Professor Emeritus of Biology at Gordon College in Massachusetts, where he taught environmental science for 28 years. He earned a B.A. from Rutgers University and a M.A. and Ph.D. in biology from Harvard University. For many years Wright received grant support from the National Science Foundation for his work in marine microbiology and, in 1981, he was a founding faculty member of Au Sable Institute of Environmental Studies in Michigan, where he also served as Academic Chairman for 11 years. He is a Fellow of the American Association for the Advancement of Science, and in 1996 was appointed a Fulbright Scholar to Kenya. He is a member of many environmental organizations, including the Nature Conservancy, Habitat for Humanity, the Union of Concerned Scientists, Massachusetts Audubon, and others, and is a supporting member of the Trustees of Reservations. Wright is involved full time in writing and speaking about the environment, and spends his spare time gardening, fishing, hiking, birding and enjoying his 7 grandchildren.
Bernard J. Nebel is Professor Emeritus of Biology at Catonsville Community College in Maryland. He earned his Bachelor of Arts from Earlham College and his Ph.D. from Duke University. Nebel was one of the first college professors to develop a comprehensive environmental science course and write a text for the subject. Nebel has recently developed an elementary (K-5) science curriculum designed to help children understand the world, their place in it, and their responsibility toward it. Nebel is a member of the American Association for the Advancement of Science, the American Institute of Biological Sciences, the American Solar Energy Society, and the National Association of Science Teachers. He strives to make a difference in the environment in his personal life; his urban backyard is a small ecosystem complex of pond, fruit trees, and garden that is supported by composted wastes. He is an active supporter of Freedom From Hunger, Habitat for Humanity, the World Wildlife Fund, Conservation International, and other environmental organizations.Excerpt. © Reprinted by permission. All rights reserved.:
As we plunge into a new century and a new millennium, the environment is being called on to satisfy the growing needs of an expanding human population in the developing countries and increasing affluence in the developed countries. In many areas, we are already taking more from Earth's systems than they can provide in a sustainable fashion—and there are still billions of people who are not adequately housed, fed, or provided with health care or a paying job. Yet we must, as soon as possible, make a transition to a sustainable civilization, one in which a stable human population recognizes the finite limits of Earth's systems to produce resources and absorb wastes, and acts accordingly. This is hard to picture at present, but it is the only future that makes any sense. If we fail to achieve it by our deliberate actions, the natural world will impose it on us in highly undesirable ways.
Environmental science stands at the interface between humans and Earth and explores the interactions and relations between them. This relationship will need to be considered in virtually all future decision making. Our text considers a full spectrum of views and information in an effort to establish a solid base of understanding and a sustainable formula for the future.
You may already be informed about some of the issues we cover in the book, such as global warming, the extinction of species, air pollution, toxic wastes, overpopulation, recycling, and the destruction of tropical rain forests. However, what you have in your hands is a readable guide and up-to-date source of information that will help you to explore the issues in more depth. It will also help you to connect them to a framework of ideas and values that will equip you to become part of the solution to many of the environmental problems confronting us.
As the field of environmental science evolves and continues to change, so has this text. In this new edition, we hope to continue to lead the change in environmental science and have made every effort to address each of the following objectives:
Because we believe that learning how to live in the environment is one of the most important subjects in any student's educational experience, we have made every effort to put in your hands a book that will help the study of environmental science come alive.
A Guide to the Eighth Edition of
The seventh edition, published in 2000, involved the following major changes in the text, as the authorship shifted entirely to one author (Wright):
The eighth edition builds on the strengths of the seventh. The unifying themes of sustainability, sound science, and stewardship are retained and continue to provide important threads linking the different subjects and chapters of the text. In the eighth edition, I continue to provide a balance between pure science and the political, social, and historical perspectives of environmental affairs. I am also careful to reflect differences in interpretation of environmental concerns where they exist, while maintaining the standard of sound science for judging those concerns.
Most important, the eighth edition reflects the changing environmental scene in the United States, as well as in the rest of the wed. Information from new books, journal articles, and Web-based reports from governmental and nongovernmental organizations has been incorporated into every chapter. New artwork has been introduced—51 new photos, 35 new diagrams, and seven new tables.
As in the seventh edition, each chapter opens with a case study or an illustrative story. Because of their relevance, a majority of these have been retained, while 10 have been replaced with new opening studies. Throughout, the high readability that the text has been known for has been maintained and strengthened. And the emphasis on science has continued, to the point where the text is more solidly grounded than ever in the physical and biological sciences as the bases for understanding every environmental issue.
Chapter 1 provides an introduction to the rest of the book by discussing present global environmental concerns; ecosystem decline has been added as one of the most important of these. The chapter introduces the three themes that will provide the unifying threads throughout the book: sustainability—the practical goal that our interactions with the natural world should be working toward; stewardship—the ethical and moral framework that should inform our public and private actions (a new ethics essay explores this theme); and sound science—the basis for our understanding of how the world works and how human systems interact with it. I include in my coverage of sound science information on the nature of science and the scientific method in order to help students distinguish sound science from "junk" science (of which I give a prime example) as they encounter controversy over scientific information.
Part I. Ecosystems and How They Work
Part I (Chapters 2-5) explores natural ecosystems—what they are, how they function, how balances are maintained, and how they evolve and change. This examination, in addition to providing an appreciation of how the natural world functions, brings out five basic sustainability principles that keep ecosystems going. A new principle—resilience—is introduced and illustrated. The five principles serve as benchmarks to evaluate the sustainability of various courses of action presented in the rest of the text.
Part II. The Human Population
Part II (Chapters 6 and 7) first looks at the dynamics of the human population. The pressures on natural systems as a result of the growth of that population are examined, with a focus on the demographic transition—the shift from high birth and death rates to low birth and death rates that has brought stable populations to the industrialized world. Then, the developing countries' difficulties through this transition are considered, and steps that are being taken on the part of the international community to address the needs of those countries are discussed. The eighth edition presents new population pyramids, the latest on debt relief, and the recent appraisal of the five-year anniversary of the International Conference on Population and Development, as well as completely updated population growth statistics.
Part III. Renewable Resources
Part III (Chapters 8-12) addresses the science of our natural resources of soil, water, and wildlife. Issues concerning the use of such resources in food production, forest growth, and fisheries management are examined in light of increasing population growth and increasing pressure on those resources: again, we all the while keep our eyes on sustainability. Some examples of issues receiving a new emphasis are (a) how erosion is measured and why the way it is measured is problematic, (b) dryland ecosystems and desertification, (c) the work of the World Water Forum, (d) the controversy surrounding genetically modified food, and (e) restoration ecology at work.
Part IV. Energy
Part IV (Chapters 13-15) presents the energy resources currently available and the consequences each can have on the environment. We learn how our past choices of energy sources to fuel the global economy have affected the environment on a global scale. The outlook regarding the impact on sustainability of the U.S. reliance on crude oil and the obvious prospects for renewable energy are presented in view of the most recent statistics and developments. Included is a discussion of the impact of new standards for appliances on energy conservation. Also examined is the option of nuclear power, despite the problems of its cost, the difficulty of nuclear waste storage and disposal, and the inherent danger's associated with nuclear power. Renewable energy is also discussed in light of its pros and cons; new information is presented on fuel cells and how they work.
Part V Pollution and Prevention
Part V (Chapters 16-22) begins with a chapter on environmental health. The precautionary principle is introduced here and is discussed in connection with risk-based public policy. The text goes on to investigate the pollution of water, land, and air that results from human activities and our interactions with the environment that were discussed in earlier chapters. The coverage ranges from the use of pesticides to protect our crops, through sewage treatment and contamination of water, to municipal and hazardous wastes, and on to major atmospheric changes and more local and regional air pollution. Examples of some new issues introduced in this edition are (a) the controversy over DDT for malaria control, (b) the dead zone in the Gulf of Mexico, (c) the "dirty dozen" persistent organic pollutants (POPs), (d) the use of MTBE in gasoline, and (e) the consequences of climate change.
Part VI. Toward a Sustainable Future
Part VI (Chapters 23 and 24) directly addresses the relationship that exists among economics, public policy, and the environment, focusing especially on our present environmental concerns. A new box discusses the World Trade Organization as an environmental issue. The text then goes on to examine how inner cities have deteriorated as a result of migration to the suburbs and urban sprawl. Some communities are working toward renewal and sustainability with a plan called Smart Growth. Part VI closes with a look at personal involvement, lifestyles, and values as vital components of our efforts to enjoy a sustainable future.
Individual Text Elements
Essays: Environmental Science features four kinds of essays: "Earth Watch," "Ethics," "Global Perspective," and "Career Link." Lists of essays are found at the end of the outline for each chapter.
Making a Difference: I believe that no amount of text-based learning about the environment truly becomes useful until students challenge themselves and those around them to begin making a difference. With this in mind, each of the six parts of the text concludes with a section that suggests courses of action that each student can take to bring about the needed changes to foster sustainability.
Chapter Opening: Each chapter begins with a set of "Key Issues and Questions"—succinct statements regarding key aspects of the issue being covered and questions inviting the student to explore those issues.
Chapter Outline: Chapter outlines may be found in the Table of Contents. Importantly, the text of each chapter is organized according to a logical outline of first-, second-, and third-order headings to assist student outlining, note taking, and learning.
Review Questions: Each chapter concludes with a set of "Review Questions" addressing each aspect of the topic covered. Of course, these questions may serve as learning objectives, as test items, or for review.
Thinking Environmentally: A set of questions, "Thinking Environmentally," is included at the end of each chapter. These questions invite the student to make connections between knowledge gleaned from the chapter and other areas of the environmental arena and to apply knowledge gained to specific environmental problems. The questions may be used also for testing or to focus class discussion.
Vocabulary: Each new term will be found in boldface type where it is first introduced and defined. All such items are found in the glossary at the end of the book.
Video Case Studies: Selected from the archives of ABC news, these timely and relevant video segments offer students an overview of a particular environmental issue or controversy. Case study material is found directly after the end of the text, but has direct application to particular chapters. A brief synopsis of each video, as well as a list of interesting questions, is included, in the hopes of stimulating healthy classroom debate and discussion of the various topics. Since videos from earlier volumes are also made available to instructors who adopt the eighth edition of Environmental Science, a list of these case studies is also provided.
Appendices: At many points in the text, reference is made to the work being done by various environmental organizations. A listing of major national environmental organizations is given in Appendix A. Most of these organizations and agencies have a home page on the Internet and can be located via the Web site that supports this text.
A conversion chart for various English and metric units is found in Appendix B.
For students who need some grounding in chemistry, a discussion of atoms, molecules, atomic bonding, and chemical reactions is provided in Appendix C.
Bibliography and Additional Reading: An updated listing of articles and books dealing with environmental topics follows the appendices, which are organized according to chapter, following a short list of general references. Also ...
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