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1、SilentspringRachelCarsonBook３Lesson11PartOne:Warm-upPartTwo:BackgroundInformationPartThree:TextAppreciationPartFour:LanguageStudyPartFive:ExtensionBook３Lesson11ContentsBTLEWLesson11–SilentSpringPartOneWarm-upENTERLesson11–SilentSpringOnEnvironmentForreferenceTobecontinuedonthenextpage.1.Whatdoyoukno
2、waboutenvironmentalpollution?Pollutionrefersprimarilytothefoulingofair,water,andlandbywastes.Thuslitter,billboards,andautojunkyardsaresaidtoconstitutevisualpollution;noiseexcessiveenoughtocausepsychologicalorphysicaldamageisconsiderednoisepollution;andwasteheatthatalterslocalclimateoraffectsfishpopu
3、lationsinriversisdesignatedthermalpollution.The20thcenturyhasseenpollutionapproachcrisisproportionsthroughouttheworld.Lesson11–SilentSpringOnEnvironmentForreferenceTobecontinuedonthenextpage.2.Whatenvironmentalproblemsdowehavenowadays?AirpollutionAirpollutioniscontaminationoftheairbynoxiousgasesandm
4、inuteparticlesofsolidandliquidmatterinconcentrationsthatendangerhealth.Themajorsourcesofairpollutionaretransportationengines,powerandheatgeneration,industrialprocesses,andtheburningofsolidwaste.Lesson11–SilentSpringOnEnvironmentTobecontinuedonthenextpage.GlobalwarmingGlobalwarmingisthegradualincreas
5、eofthetemperatureoftheearth'sloweratmosphereasaresultoftheincreaseingreenhousegases.Somelonger-termresultsofglobalwarmingincludemeltingofpolarice,witharesultingriseinsealevelandcoastalflooding;disruptionofdrinkingwatersuppliesdependentonsnowmelts;profoundchangesinagricultureduetoclimatechange.Amongf
6、actorsthatmaybecontributingtoglobalwarmingaretheburningofcoal,petroleumproducts,anddeforestation.Lesson11–SilentSpringOnEnvironmentTobecontinuedonthenextpage.NoisepollutionHumancreatednoiseharmfultohealthorwelfare.Transportationvehiclesaretheworstoffenders,withaircraft,trucks,buses,automobiles,andmo
7、torcyclesallproducingexcessivenoise.Apartfromhearingloss,noisecancauselackofsleep,irritability,heartburn,indigestion,highbloodpressure,andpossiblyheartdisease.Noise-inducedstresscreatesseveretensionin
