Humans, Other Beings and the Environment

Download Humans, Other Beings and the Environment PDF Online Free

Author :
Publisher : Cambridge Scholars Publishing
ISBN 13 : 1443884332
Total Pages : 235 pages
Book Rating : 4.4/5 (438 download)

DOWNLOAD NOW!


Book Synopsis Humans, Other Beings and the Environment by : Munyaradzi Mawere

Download or read book Humans, Other Beings and the Environment written by Munyaradzi Mawere and published by Cambridge Scholars Publishing. This book was released on 2015-10-05 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humans, Other Beings and the Environment is an ethnographic study of the possibilities for the mutual, symbiotic co-existence of human beings, a unique species of forest insects and natural forests. The result of extensive fieldwork conducted over a period of thirteen months, the book highlights the continuum among humans, wild insects and environmental conservation outcomes in a specific environment of southeastern Norumedzo in rural Zimbabwe. In this respect, it describes interactions and relationships between humans, other beings and the natural forests to demonstrate how some aspects of the emerging body of literature in the posthumanities and relational ontologies can work to grasp the collaborative interactional space for different social actors in the cosmos, through which cognitive and knowledge communities can be extended. Furthermore, the book raises critical questions for conservation sciences, political ecology and environmental anthropology, as it demonstrates the extent of relevance and application of the Norumedzo conservation case study, with particular regard to conservational problems and asymmetrical relations between humans and other beings in other scenarios in Zimbabwe and beyond. Complicating many assumptions about knowledge production, nature and culture, the book offers independent and critical insights into the interpretation of modernist science, posthumanist ideas and indigenous epistemologies, and relates these to existing studies. As such, it will be of interest not only to anthropologists, but also to political scientists, environmentalists and policy makers in Zimbabwe, southern Africa and beyond.

Health and the Environment in the Southeastern United States

Download Health and the Environment in the Southeastern United States PDF Online Free

Author :
Publisher : National Academies Press
ISBN 13 : 0309085411
Total Pages : 84 pages
Book Rating : 4.3/5 (9 download)

DOWNLOAD NOW!


Book Synopsis Health and the Environment in the Southeastern United States by : Institute of Medicine

Download or read book Health and the Environment in the Southeastern United States written by Institute of Medicine and published by National Academies Press. This book was released on 2002-11-30 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this regional workshop in the Southeast was to broaden the environmental health perspective from its typical focus on environmental toxicology to a view that included the impact of the natural, built, and social environments on human health. Early in the planning, Roundtable members realized that the process of engaging speakers and developing an agenda for the workshop would be nearly as instructive as the workshop itself. In their efforts to encourage a wide scope of participation, Roundtable members sought input from individuals from a broad range of diverse fields-urban planners, transportation engineers, landscape architects, developers, clergy, local elected officials, heads of industry, and others. This workshop summary captures the discussions that occurred during the two-day meeting. During this workshop, four main themes were explored: (1) environmental and individual health are intrinsically intertwined; (2) traditional methods of ensuring environmental health protection, such as regulations, should be balanced by more cooperative approaches to problem solving; (3) environmental health efforts should be holistic and interdisciplinary; and (4) technological advances, along with coordinated action across educational, business, social, and political spheres, offer great hope for protecting environmental health. This workshop report is an informational document that provides a summary of the regional meeting.

Understanding Climate's Influence on Human Evolution

Download Understanding Climate's Influence on Human Evolution PDF Online Free

Author :
Publisher : National Academies Press
ISBN 13 : 0309148383
Total Pages : 128 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis Understanding Climate's Influence on Human Evolution by : National Research Council

Download or read book Understanding Climate's Influence on Human Evolution written by National Research Council and published by National Academies Press. This book was released on 2010-04-17 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hominin fossil record documents a history of critical evolutionary events that have ultimately shaped and defined what it means to be human, including the origins of bipedalism; the emergence of our genus Homo; the first use of stone tools; increases in brain size; and the emergence of Homo sapiens, tools, and culture. The Earth's geological record suggests that some evolutionary events were coincident with substantial changes in African and Eurasian climate, raising the possibility that critical junctures in human evolution and behavioral development may have been affected by the environmental characteristics of the areas where hominins evolved. Understanding Climate's Change on Human Evolution explores the opportunities of using scientific research to improve our understanding of how climate may have helped shape our species. Improved climate records for specific regions will be required before it is possible to evaluate how critical resources for hominins, especially water and vegetation, would have been distributed on the landscape during key intervals of hominin history. Existing records contain substantial temporal gaps. The book's initiatives are presented in two major research themes: first, determining the impacts of climate change and climate variability on human evolution and dispersal; and second, integrating climate modeling, environmental records, and biotic responses. Understanding Climate's Change on Human Evolution suggests a new scientific program for international climate and human evolution studies that involve an exploration initiative to locate new fossil sites and to broaden the geographic and temporal sampling of the fossil and archeological record; a comprehensive and integrative scientific drilling program in lakes, lake bed outcrops, and ocean basins surrounding the regions where hominins evolved and a major investment in climate modeling experiments for key time intervals and regions that are critical to understanding human evolution.

Ten Billion

Download Ten Billion PDF Online Free

Author :
Publisher : Vintage
ISBN 13 : 0345806468
Total Pages : 208 pages
Book Rating : 4.3/5 (458 download)

DOWNLOAD NOW!


Book Synopsis Ten Billion by : Stephen Emmott

Download or read book Ten Billion written by Stephen Emmott and published by Vintage. This book was released on 2013-09-10 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deforestation. Desertification. Species extinction. Global warming. Growing threats to food and water. The driving issues of our times are the result of one huge problem: Us. As the population continues to grow, our problems will increase. And this means that every way we look at it, a planet of ten billion people is likely to be a nightmare. Stephen Emmott, a scientist whose lab is at the forefront of research into complex natural systems, sounds the alarm. TEN BILLION is a snapshot of our planet, and our species, approaching a crisis, and a stark analysis of where this leaves us. TEN BILLION is not another climate book. TEN BILLION is a book about us.

Human Well-Being and the Natural Environment

Download Human Well-Being and the Natural Environment PDF Online Free

Author :
Publisher : Oxford University Press on Demand
ISBN 13 : 0199247889
Total Pages : 328 pages
Book Rating : 4.1/5 (992 download)

DOWNLOAD NOW!


Book Synopsis Human Well-Being and the Natural Environment by : Partha Dasgupta

Download or read book Human Well-Being and the Natural Environment written by Partha Dasgupta and published by Oxford University Press on Demand. This book was released on 2001-11-15 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Human Well-Being and the Natural Environment, Partha Dasgupta explores ways to measure the quality of life. Although the problem pervades a number of academic disciplines, it is not confined to the academic realm. International organizations regularly publish cross-country estimates of the quality of life, journalists and commentators publicize them, and national governments are obliged to take note of them. Today, quality-of-life indices broker political arguments andtogether form a coin that even helps purchase economic and social policy.It is therefore ironic that indices of human well-being in current use are notably insensitive to our dependence on the natural environment, both at a moment in time and across generations. Moreover, international discussions on economic development in poor regions all too frequently ignore the natural resource base. In developing quality-of-life measures, Professor Dasgupta pays particular attention to the natural environment, illustrating how it can be incorporated, more generally, intoeconomic reasoning in a seamless manner. The result is a treatise that goes beyond quality-of-life measures and offers a comprehensive account of the newly emergent subject of ecological economics. The connections between biodiversity, ecosystem services, resource scarcities, and economic possibilitiesfor the future are developed in a quantitative, but accessible, language. Such familiar terms as 'sustainable development', 'social discount rates', and Earth's 'carrying capacity' are given a firm theoretical underpinning. The theory that is developed is then put to use in extended commentaries on the economics of population, poverty traps, global warming, structural adjustment programmes, and free trade. The author shows that, whether we are interested in valuing the state of affairs in acountry or in evaluating economic policy there, the index that should be used is the economy's wealth, which is the social worth of its capital assets. The concept of wealth adopted here is a comprehensive one, including not only manufactured assets, but also human capital, knowledge, and the naturalenvironment. Wealth is contrasted with such popular measures of human well-being as gross national product and the United Nations Development Programme's Human Development Index.Although the theory developed here is not restricted in its applicability to the circumstances facing poor countries, the exposition is prompted by the author's concerns over the dilemmas facing poor people in those parts of world. Repeatedly, he applies the theory to data on poor countries. The picture that emerges is a sobering one and contrasts sharply with that portrayed in the contemporary literature on economic development.The book has been written not only for fellow economists, but also for students of economics, environmental studies, political science, and political philosophy. It is intended even more broadly for the general citizen interested in human well-being and the centrality of the natural environment to our everyday lives.

Global Environmental Change

Download Global Environmental Change PDF Online Free

Author :
Publisher : National Academies Press
ISBN 13 : 0309044944
Total Pages : 321 pages
Book Rating : 4.3/5 (9 download)

DOWNLOAD NOW!


Book Synopsis Global Environmental Change by : National Research Council

Download or read book Global Environmental Change written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global environmental change often seems to be the most carefully examined issue of our time. Yet understanding the human sideâ€"human causes of and responses to environmental changeâ€"has not yet received sustained attention. Global Environmental Change offers a strategy for combining the efforts of natural and social scientists to better understand how our actions influence global change and how global change influences us. The volume is accessible to the nonscientist and provides a wide range of examples and case studies. It explores how the attitudes and actions of individuals, governments, and organizations intertwine to leave their mark on the health of the planet. The book focuses on establishing a framework for this new field of study, identifying problems that must be overcome if we are to deepen our understanding of the human dimensions of global change, presenting conclusions and recommendations.

The Uninhabitable Earth

Download The Uninhabitable Earth PDF Online Free

Author :
Publisher : Tim Duggan Books
ISBN 13 : 052557672X
Total Pages : 384 pages
Book Rating : 4.5/5 (255 download)

DOWNLOAD NOW!


Book Synopsis The Uninhabitable Earth by : David Wallace-Wells

Download or read book The Uninhabitable Earth written by David Wallace-Wells and published by Tim Duggan Books. This book was released on 2019-02-19 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: #1 NEW YORK TIMES BESTSELLER • “The Uninhabitable Earth hits you like a comet, with an overflow of insanely lyrical prose about our pending Armageddon.”—Andrew Solomon, author of The Noonday Demon NAMED ONE OF THE BEST BOOKS OF THE YEAR BY The New Yorker • The New York Times Book Review • Time • NPR • The Economist • The Paris Review • Toronto Star • GQ • The Times Literary Supplement • The New York Public Library • Kirkus Reviews It is worse, much worse, than you think. If your anxiety about global warming is dominated by fears of sea-level rise, you are barely scratching the surface of what terrors are possible—food shortages, refugee emergencies, climate wars and economic devastation. An “epoch-defining book” (The Guardian) and “this generation’s Silent Spring” (The Washington Post), The Uninhabitable Earth is both a travelogue of the near future and a meditation on how that future will look to those living through it—the ways that warming promises to transform global politics, the meaning of technology and nature in the modern world, the sustainability of capitalism and the trajectory of human progress. The Uninhabitable Earth is also an impassioned call to action. For just as the world was brought to the brink of catastrophe within the span of a lifetime, the responsibility to avoid it now belongs to a single generation—today’s. LONGLISTED FOR THE PEN/E.O. WILSON LITERARY SCIENCE WRITING AWARD “The Uninhabitable Earth is the most terrifying book I have ever read. Its subject is climate change, and its method is scientific, but its mode is Old Testament. The book is a meticulously documented, white-knuckled tour through the cascading catastrophes that will soon engulf our warming planet.”—Farhad Manjoo, The New York Times “Riveting. . . . Some readers will find Mr. Wallace-Wells’s outline of possible futures alarmist. He is indeed alarmed. You should be, too.”—The Economist “Potent and evocative. . . . Wallace-Wells has resolved to offer something other than the standard narrative of climate change. . . . He avoids the ‘eerily banal language of climatology’ in favor of lush, rolling prose.”—Jennifer Szalai, The New York Times “The book has potential to be this generation’s Silent Spring.”—The Washington Post “The Uninhabitable Earth, which has become a best seller, taps into the underlying emotion of the day: fear. . . . I encourage people to read this book.”—Alan Weisman, The New York Review of Books

The World Without Us

Download The World Without Us PDF Online Free

Author :
Publisher : Macmillan
ISBN 13 : 9780312427900
Total Pages : 436 pages
Book Rating : 4.4/5 (279 download)

DOWNLOAD NOW!


Book Synopsis The World Without Us by : Alan Weisman

Download or read book The World Without Us written by Alan Weisman and published by Macmillan. This book was released on 2008-08-05 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: A penetrating take on how our planet would respond without the relentless pressure of the human presence

Ecohumanism

Download Ecohumanism PDF Online Free

Author :
Publisher : Humanism Today
ISBN 13 : 9781573929370
Total Pages : 0 pages
Book Rating : 4.9/5 (293 download)

DOWNLOAD NOW!


Book Synopsis Ecohumanism by : Robert B. Tapp

Download or read book Ecohumanism written by Robert B. Tapp and published by Humanism Today. This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humanists are sometimes accused of being so focused on the human race that they ignore the environment and other species. This book is designed to address these criticisms. The contributors, all humanists in the naturalistic tradition, show that in fact humanism as a worldview has much to offer environmentalism. Since humanists are committed to working for a global community in which all humans can flourish, they are as concerned about ecological degradation as environmentalists. But in regard to what should be done about environmental problems, humanists do not hesitate to use the best scientific information and technology to reclaim the natural world while ensuring the welfare of all human beings. Humanists stress that science and technology must be used responsibly and that human beings must learn to give up destructive ideological fantasies, whether political or religious. The contributors are Vern L. Bullough, Gwen Whitehead Brewer, Richard Gilbert, Michael J. Kami, Gerald Larue, Timothy J. Madigan, Sarah Oelberg, Don Page, Howard B. Radest, Philip J. Regal, Andreas Rosenberg, Harvey Sarles, David Schafer, John M. Swomley, Robert B. Tapp, Michael Werner, and Carol Wintermute.

U.S. Health in International Perspective

Download U.S. Health in International Perspective PDF Online Free

Author :
Publisher : National Academies Press
ISBN 13 : 0309264146
Total Pages : 421 pages
Book Rating : 4.3/5 (92 download)

DOWNLOAD NOW!


Book Synopsis U.S. Health in International Perspective by : National Research Council

Download or read book U.S. Health in International Perspective written by National Research Council and published by National Academies Press. This book was released on 2013-04-12 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States is among the wealthiest nations in the world, but it is far from the healthiest. Although life expectancy and survival rates in the United States have improved dramatically over the past century, Americans live shorter lives and experience more injuries and illnesses than people in other high-income countries. The U.S. health disadvantage cannot be attributed solely to the adverse health status of racial or ethnic minorities or poor people: even highly advantaged Americans are in worse health than their counterparts in other, "peer" countries. In light of the new and growing evidence about the U.S. health disadvantage, the National Institutes of Health asked the National Research Council (NRC) and the Institute of Medicine (IOM) to convene a panel of experts to study the issue. The Panel on Understanding Cross-National Health Differences Among High-Income Countries examined whether the U.S. health disadvantage exists across the life span, considered potential explanations, and assessed the larger implications of the findings. U.S. Health in International Perspective presents detailed evidence on the issue, explores the possible explanations for the shorter and less healthy lives of Americans than those of people in comparable countries, and recommends actions by both government and nongovernment agencies and organizations to address the U.S. health disadvantage.

In the Light of Evolution

Download In the Light of Evolution PDF Online Free

Author :
Publisher : Sackler Colloquium
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis In the Light of Evolution by : National Academy of Sciences

Download or read book In the Light of Evolution written by National Academy of Sciences and published by Sackler Colloquium. This book was released on 2007 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arthur M. Sackler Colloquia of the National Academy of Sciences address scientific topics of broad and current interest, cutting across the boundaries of traditional disciplines. Each year, four or five such colloquia are scheduled, typically two days in length and international in scope. Colloquia are organized by a member of the Academy, often with the assistance of an organizing committee, and feature presentations by leading scientists in the field and discussions with a hundred or more researchers with an interest in the topic. Colloquia presentations are recorded and posted on the National Academy of Sciences Sackler colloquia website and published on CD-ROM. These Colloquia are made possible by a generous gift from Mrs. Jill Sackler, in memory of her husband, Arthur M. Sackler.

Planetary Health

Download Planetary Health PDF Online Free

Author :
Publisher : Island Press
ISBN 13 : 1610919661
Total Pages : 538 pages
Book Rating : 4.6/5 (19 download)

DOWNLOAD NOW!


Book Synopsis Planetary Health by : Samuel Myers

Download or read book Planetary Health written by Samuel Myers and published by Island Press. This book was released on 2020-08-13 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Human health depends on the health of the planet. Earth’s natural systems—the air, the water, the biodiversity, the climate—are our life support systems. Yet climate change, biodiversity loss, scarcity of land and freshwater, pollution and other threats are degrading these systems. The emerging field of planetary health aims to understand how these changes threaten our health and how to protect ourselves and the rest of the biosphere. Planetary Health: Protecting Nature to Protect Ourselves provides a readable introduction to this new paradigm. With an interdisciplinary approach, the book addresses a wide range of health impacts felt in the Anthropocene, including food and nutrition, infectious disease, non-communicable disease, dislocation and conflict, and mental health. It also presents strategies to combat environmental changes and its ill-effects, such as controlling toxic exposures, investing in clean energy, improving urban design, and more. Chapters are authored by widely recognized experts. The result is a comprehensive and optimistic overview of a growing field that is being adopted by researchers and universities around the world. Students of public health will gain a solid grounding in the new challenges their profession must confront, while those in the environmental sciences, agriculture, the design professions, and other fields will become familiar with the human consequences of planetary changes. Understanding how our changing environment affects our health is increasingly critical to a variety of disciplines and professions. Planetary Health is the definitive guide to this vital field.

The Nature of Being Human

Download The Nature of Being Human PDF Online Free

Author :
Publisher : JHU Press
ISBN 13 : 0801891299
Total Pages : 312 pages
Book Rating : 4.8/5 (18 download)

DOWNLOAD NOW!


Book Synopsis The Nature of Being Human by : Harold Fromm

Download or read book The Nature of Being Human written by Harold Fromm and published by JHU Press. This book was released on 2009-05-04 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the physical relationship between the natural world and individuals is quantifiable, the psychosocial effect of the former on the latter is often less tangible. What, for instance, is the connection between the environment in which we live and our creativity? How is our consciousness bounded and delimited by our materiality? And from whence does our idea of self and our belief in free will derive and when do our surroundings challenge these basic assumptions? Ecocritic Harold Fromm's challenging exploration of these and related questions twines his own physical experiences and observations with insights gathered from both the humanities and the sciences. Writing broadly and personally, Fromm explores our views of nature and how we write about it. He ties together ecology, evolutionary psychology, and consciousness studies to show that our perceived separation from our surroundings is an illusory construct. He argues for a naturalistic vision of creativity, free will, and the literary arts unimpeded by common academic and professional restraints. At each point of this intellectual journey, Fromm is honest, engaging, and unsparing. Philosophical, critical, often personal, Fromm's sweeping, interdisciplinary, and sometimes combative essays will change the way you think about your place in the environment.

Understanding the Changing Planet

Download Understanding the Changing Planet PDF Online Free

Author :
Publisher : National Academies Press
ISBN 13 : 0309150752
Total Pages : 172 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis Understanding the Changing Planet by : National Research Council

Download or read book Understanding the Changing Planet written by National Research Council and published by National Academies Press. This book was released on 2010-07-23 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the oceans to continental heartlands, human activities have altered the physical characteristics of Earth's surface. With Earth's population projected to peak at 8 to 12 billion people by 2050 and the additional stress of climate change, it is more important than ever to understand how and where these changes are happening. Innovation in the geographical sciences has the potential to advance knowledge of place-based environmental change, sustainability, and the impacts of a rapidly changing economy and society. Understanding the Changing Planet outlines eleven strategic directions to focus research and leverage new technologies to harness the potential that the geographical sciences offer.

The Environment and World History

Download The Environment and World History PDF Online Free

Author :
Publisher : Univ of California Press
ISBN 13 : 9780520256873
Total Pages : 384 pages
Book Rating : 4.2/5 (568 download)

DOWNLOAD NOW!


Book Synopsis The Environment and World History by : Edmund Burke

Download or read book The Environment and World History written by Edmund Burke and published by Univ of California Press. This book was released on 2009 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 11 essays, the contributors examine the connections between environmental change and other major topics of early modern world history: population growth, commercialization, imperialism, industrialization, the fossil fuel revolution, and more.

Technology versus Ecology: Human Superiority and the Ongoing Conflict with Nature

Download Technology versus Ecology: Human Superiority and the Ongoing Conflict with Nature PDF Online Free

Author :
Publisher : IGI Global
ISBN 13 : 1466645873
Total Pages : 347 pages
Book Rating : 4.4/5 (666 download)

DOWNLOAD NOW!


Book Synopsis Technology versus Ecology: Human Superiority and the Ongoing Conflict with Nature by : Schultz, Robert A.

Download or read book Technology versus Ecology: Human Superiority and the Ongoing Conflict with Nature written by Schultz, Robert A. and published by IGI Global. This book was released on 2013-09-30 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although human beings are technically part of the ecosystem, there still remains a conceptual conflict between technology and nature. These concerns highlight the idea of human superiority in which the priority is given to technology versus living in synchronization with nature. Technology versus Ecology: Human Superiority and the Ongoing Conflict with Nature explores the issues revolving around the conflict between technology versus human beings, the concern for the separation of human beings in the ecosystem, and the negative consequences that may follow as ecosystems are being damaged. This book is a significant reference source for researchers, instructors, and students interested in the constant evolution of technology and ecology.

The Perception of the Environment

Download The Perception of the Environment PDF Online Free

Author :
Publisher : Routledge
ISBN 13 : 1000504662
Total Pages : 644 pages
Book Rating : 4.0/5 (5 download)

DOWNLOAD NOW!


Book Synopsis The Perception of the Environment by : Tim Ingold

Download or read book The Perception of the Environment written by Tim Ingold and published by Routledge. This book was released on 2021-11-29 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work Tim Ingold offers a persuasive new approach to understanding how human beings perceive their surroundings. He argues that what we are used to calling cultural variation consists, in the first place, of variations in skill. Neither innate nor acquired, skills are grown, incorporated into the human organism through practice and training in an environment. They are thus as much biological as cultural. To account for the generation of skills we have therefore to understand the dynamics of development. And this in turn calls for an ecological approach that situates practitioners in the context of an active engagement with the constituents of their surroundings. The twenty-three essays comprising this book focus in turn on the procurement of livelihood, on what it means to ‘dwell’, and on the nature of skill, weaving together approaches from social anthropology, ecological psychology, developmental biology and phenomenology in a way that has never been attempted before. The book is set to revolutionise the way we think about what is ‘biological’ and ‘cultural’ in humans, about evolution and history, and indeed about what it means for human beings – at once organisms and persons – to inhabit an environment. The Perception of the Environment will be essential reading not only for anthropologists but also for biologists, psychologists, archaeologists, geographers and philosophers. This edition includes a new Preface by the author.