《经济学专业英语教程(精编版)( 第二版 )》课件Unit 12.ppt
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- 经济学专业英语教程精编版 第二版 经济学专业英语教程精编版 第二版 课件Unit 12 经济学 专业 英语 教程 精编 第二 课件 Unit
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1、Unit 12Text:Environmental Protection(环境保护)1.Key words2.Externality3.Forms of environmental pollution4.Causes for environmental pollution5.Controls of environmental pollution6.Questionsenvironmental pollutionone-way externalityuncompensated damageindustrial establishmentmarginal utilityorganic sewage
2、self-purification.atmospheric pollutionpollution controlnoxious dischargesbody of waterpollution abatementwater purificationwater cleanlinessmarginal benefitmarginal costinternalizing the externalitiesbiochemical oxygen demandA situation in which action by one consumer or producer confers benefit or
3、 inflicts damage on another consumer or producer is said to involve externalities.Environmental pollution typically involves one-way externality,in which the actions of one producer or consumer inflict uncompensated damage on other producers and consumers.3.1 Air pollution3.2 Water pollution3.3 Accu
4、mulation of solid wastes3.4 Noise pollutionThis is the discharge of noxious gases and solid particles into the atmosphere,leading to“smog”conditions in many metropolitan areas.This type of pollution arises from discharge of organic and inorganic wastes into streams and lakes.The automobile junkyard
5、is the most conspicuous example.This is a level of background noise that can range from mildly unpleasant to literally deafening.With the growth of population and production,clean air and pure water have become scarce goods,particularly in the metropolitan areas where most of the population resides.
6、Natural processes can no longer cope unaided with the flow of waste materials,and the environment can become overloaded to a degree that produces permanent deterioration.Discharge of plant nutrients into a lake can stimulate the growth of weeds and algae to the point where the lake fills up with sol
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