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الاثنين، 10 ديسمبر 2012
موضوع مقالة تعبير باللغة الانجليزية عن حلول للتلوث البئي treatment for environmental pollution
في هذا الفيديو سوف نرى تقنيات كتابة منهجية لموضوع تعبير في اللغة الانجليزية عن حلول للتلوث البئي treatment for environmental pollution, سوف تتعلم أهم الأساليب التي تساعدك على أن تكتب مقالة ممنهجة بسهولة دون أخطاء في وقت قليل, تعليم تقنيات كتابة مقدمة وموضوع وخاتمة التعبير المدرسي في اللغة الانجليزية عن حلول للتلوث البئي treatment for environmental pollution, أفضل وسيلة لتعلم اللغة الانجليزية هي الكتابة, التعبير الموضوع مقالة مدرسية how to write English essay and articles easily without mistakes, this vidoe will teach you how to write methodically an essay in English easily and quickly تعلم كيف تكتب مقالات باللغة الانجليزية بسرعة وسهولة. Learn English online with the help of this free website from the British Council with games, stories, listening activities and grammar exercises. Learn English offers English grammar and extensive British English vocabulary sections along with a free English magazine and diary, games, lessons and tests Improve your English grammar, speaking, listening, reading, and vocabulary. Free resources to help you learn English, including phrase guide and vocabulary lists with sound, forums, and shop The earliest precursor of pollution generated by life forms would have been a natural function of their existence. The attendant consequences on viability and population levels fell within the sphere of natural selection. These would have included the demise of a population locally or ultimately, species extinction. Processes that were untenable would have resulted in a new balance brought about by changes and adaptations. At the extremes, for any form of life, consideration of pollution is superseded by that of survival.
For humankind, the factor of technology is a distinguishing and critical consideration, both as an enabler and an additional source of byproducts. Short of survival, human concerns include the range from quality of life to health hazards. Since science holds experimental demonstration to be definitive, modern treatment of toxicity or environmental harm involves defining a level at which an effect is observable. Common examples of fields where practical measurement is crucial include automobile emissions control, industrial exposure (e.g. Occupational Safety and Health Administration (OSHA) PELs), toxicology (e.g. LD50), and medicine (e.g. medication and radiation doses).
"The solution to pollution is dilution", is a dictum which summarizes a traditional approach to pollution management whereby sufficiently diluted pollution is not harmful. It is well-suited to some other modern, locally scoped applications such as laboratory safety procedure and hazardous material release emergency management. But it assumes that the dilutant is in virtually unlimited supply for the application or that resulting dilutions are acceptable in all cases.
Such simple treatment for environmental pollution on a wider scale might have had greater merit in earlier centuries when physical survival was often the highest imperative, human population and densities were lower, technologies were simpler and their byproducts more benign. But these are often no longer the case. Furthermore, advances have enabled measurement of concentrations not possible before. The use of statistical methods in evaluating outcomes has given currency to the principle of probable harm in cases where assessment is warranted but resorting to deterministic models is impractical or infeasible. In addition, consideration of the environment beyond direct impact on human beings has gained prominence.
Yet in the absence of a superseding principle, this older approach predominates practices throughout the world. It is the basis by which to gauge concentrations of effluent for legal release, exceeding which penalties are assessed or restrictions applied. One such superseding principle is contained in modern hazardous waste laws in developed countries, as the process of diluting hazardous waste to make it non-hazardous is usually a regulated treatment process. Migration from pollution dilution to elimination in many cases can be confronted by challenging economical and technological barriers.