Xem 1-16 trên 16 kết quả Ecology comes
  • In the decade that has passed since the first edition of this book, the global environment has changed rapidly. Even the most steadfast ‘‘deny-ers’’ have come to accept that atmospheric CO2 enrichment and global warming pose serious challenges to life on Earth.

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  • Natural and social scientists face a great challenge in the coming decades: to understand the role that humans play in ecosystems, particularly urban ecosystems. Cities and urbanizing regions are complex coupled humannatural systems in which people are the dominant agents. As humans transform natural landscapes into highly human-dominated environments, they create a new set of ecological conditions by changing ecosystem processes and dynamics.

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  • The editors express gratitude to the people whose advice and help at critical points in the project helped the volume come to fruition. Leanne Nash, Catherine Tucker, Glenn Stone, Dick Norgaard, as well as reviewers for New York University Press, pointed us to useful publications. Nora Haenn worked on the reader as a Mellon Foundation Fellow in Anthropology and Demography while at the Carolina Population Center, University of North Carolina. In addition to the Foundation, she thanks the Carolina Population Center for building such a supportive research atmosphere.

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  • R RADIATION ECOLOGY Radiation Ecology or Radioecology is a term that came into common usage in 1956 to denote that area of the broad field of ecology concerned with the assessment of radioactivity in the environment. More specifically, radiation ecology has come to be recognized as that area of ecology concerned with radioactive substances, radiation and the environment.

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  • This is a work in progress. It is a work that has been in progress for at least the last ten years if not more. It is a work that has much more yet to come. The study of environmental harm is relatively new for most criminologists. For myself, in writing this book I have had to draw upon my own work over the last decade plus that of a relatively small handful of criminologists who are fellow travellers in this area. On the other hand, there is a wealth of material from other fields and disciplines that is entirely relevant and useful to a study such as this...

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  • S ystems ecology, also called ecosystem theory, offers today a complete theory about how ecosystems are working as systems. The theory will inevitably be improved in the coming years, when it hopefully will be used increasingly to explain ecological observations and to facilitate environmental management including the use of ecotechnology. The theory is, however, sufficiently developed today to be presented as a complete theory that offers a wide spectrum of applications.

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  • Those who have denied the reality of moral distinctions, may be ranked among the disingenuous disputants; nor is it conceivable, that any human creature could ever seriously believe, that all characters and actions were alike entitled to the affection and regard of everyone.

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  • Knowing nature is a complex, multiple, and highly political process. This is clearly illustrated by looking at the knowledge and management of a piece of land, seemingly isolated but impacting and impacted by decision- making processes, politics, and technology around the world. A barren stretch of ground in the Sahelian region of West Africa holds diverse meanings to different people and institutions. Livestock herders value it for its proximity to a water point and for the grass it will grow once the rains come.

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  • I often enjoy my lunch at a small café named Holly Berry’s. It’s one of those places where people quickly know your name, at least your first name, where congeniality and food are offered with equal gusto. I was talking to Jack, who most folks would describe as a cook until they taste his food, at which point he’d be better described as a chef. Jack asked me if I was writing a book while on sabbatical and I said that I was, one about the concept of the balance of nature. Jack allowed as to how he had not given a great deal of thought to the...

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  • As shown later, much of the resultant risk to human populations and the ecosystems upon which they depend comes from the pro- jected extremely rapid rate of change in climatic conditions. Indeed, the prospect of such change has stimulated a great deal of new scientific research over the past decade, much of which is elucidating the complex ecological disturbances that can impact on human well-being and health—as in the following example.

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  • Honey bees (Apis mellifera L.) are the main pollinating agents for numerous plants and fruit trees and, hence, play a key role in agriculture and more generally in the maintenance of ecological biodiversity. Although these social insects are not the targets of all the different agrochemical treatments used in crop protection, they are widely affected by pesticides.

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  • We therefore come from widely differing backgrounds: foreign ministers, finance and planning officials, policymakers in agriculture, science, and technology. Many of the Commissioners are cabinet ministers and senior economists in their own nations, concerned largely with the affairs of those countries. As Commissioners, however, we were acting not in our national roles but as individuals; and as we worked, nationalism and the artificial divides between "industrialized" and "developing", between East and West, receded.

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  • Natural resource managers and conservationists are coming to grips with the fact that rapid global warming and associated climate changes are already having a considerable impact on the world’s ecological systems. More and larger shifts are expected, even in the best-case scenarios for greenhouse gas emissions reductions and future warming. These climate changes are ushering in a fundamental shift in natural resource management and conservation, to help natural systems withstand and adapt to new climate conditions.

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  • Over the past few decades, life-threatening environmental concerns have surfaced in the developing world. Countrysides are coming under pressure from increasing numbers of farmers and the landless. Cities are filling with people, cars, and factories.

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  • The long-term good health of populations depends on the continued stability and functioning of the biosphere’s ecological and physical systems, often referred to as life-support systems. We ignore this long-established historical truth at our peril: yet it is all too easy to overlook this dependency, particularly at a time when the human species is becoming increasingly urbanized and distanced from these natural systems.

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  • How should the law reflect the phenomenon of interdependence in human relationships? This is the question raised in this book. Intuitively, we recognize that ours is a world of interdependence: ecological equilibrium rests upon an understanding of interdependence among species, international peace is built upon the concept of the interdependence of nations, and economic prosperity relies upon shared commercial arrangements and mutually accessible markets.

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