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This sourcebook considers species extinction as the product of both natural selection and human activity; it then suggests ways to minimize the latter cause, and estimates the cost to human civilization of such efforts. Offers a chronology of events related to endangered species, biographical sketches of noted proponents of preservation, an overview of pertinent US legislation and litigation as well as international treaties, a directory of organizations, and annotated listings of print and nonprint resources. Annotation copyrighted by Book News, Inc., Portland, OR
Vols. for 1911-13 contain the Proceedings of the Helminothological Society of Washington, ISSN 0018-0120, 1st-15th meeting.
Tree species are ecologically, culturally and economically valuable components of biodiversity and their conservation is essential to the well-being of people in all countries of the world. With increasing general pressures on ecosystems and selective pressures on species, it has become apparent that many tree species are threatened with extinction. The world list of threatened trees presents the results of the first survey of the conservation status of tree species worldwide.