文章Cars,pollution and health.doc

文章Cars,pollution and health.doc

ID:35986108

大小:31.50 KB

页数:4页

时间:2019-04-29

文章Cars,pollution and health.doc_第1页
文章Cars,pollution and health.doc_第2页
文章Cars,pollution and health.doc_第3页
文章Cars,pollution and health.doc_第4页
资源描述:

《文章Cars,pollution and health.doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库

1、Cars,AirPollutionandHealthCarshavetwooppositepersonalities.Oneisfriendlyandattractivetheotherisdestructiveandcanbelethal.Thedesiretoownacarislinkedtopleasure,sexuality,convenienceandfreedom.Menlustforattractive,prestigiouscarstheywaytheylustforwomenandwomendes

2、iremenwithattractive,prestigiouscars. Carmanufacturershavelongusedattractive,lightlycladwomentoadvertisetheirlatestautodesigns.Menarealsointerestedinpower,performanceandwanttoknowsomethingabouttheengine,althoughmodernenginesaresufficientlycomplextodiscourageev

3、entheprofessionalmechanic.Someofthenewenginecomplexityinvolvesemissioncontrolsystemsthatrequireelectronicmonitoringandadjustmentofengineperformanceunderdifferentoperatingconditions.Severaldevicesareaddedtotheenginetohandleairflowin,fueldeliveryandexhaustout.Co

4、mputershavebeenaddedtomonitorandcontrolengineperformance.Mostcarenginesdesignedafter1996haveastandardportthatallowsadiagnosticcomputeraccesstoinformationaboutengineperformance.Drivingacaristhemostpollutingactanaveragecitizencommits.Emissionsfrompassengervehicl

5、esareincreasinginCanadaandtheUSdespiteattemptstomakeenginesmorefuelefficientanddespitetheadditionofantipollutiondevices.Themainreasonisthatcarsaregettingbiggerandpick-uptrucks,vansandsportsvehiclesareoftenreplacingsmaller,lighterpassengercars.Theaveragenewvehi

6、clein2003consumedmorefuelthatitscounterpartin1988.IntheUSAin1987carsaveraged25.9milestothegallon.Fuelefficiencydroppedto24.6miles/gallonby1998andisdroppingfurtheraslargervehiclesreplacesmallerones.Despitescientificevidence,governmentsinmostaffluentcountrieshav

7、eignoredtheirresponsibilitytoreduceemissionsofgreenhousegases.TheUSAisbiggestemitterofgreenhousegasesworldwide.USemissionshaveincreasedto7billiontonesofCO2in2004,16%higherthanemissionsinthelate90's.TheUKhasdonebetterreducingtheiremissionstoabout0.6billiontons,

8、14%below 1990levels.Exhaustfromallcombustionenginescombinetoproducelocaladverseeffectsonthehealthofcarusersandallinnocentbystanders.Citieshavebecomeislandsoftoxicchemicalsfromtheun

当前文档最多预览五页,下载文档查看全文

此文档下载收益归作者所有

当前文档最多预览五页,下载文档查看全文
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。