高二英语unit9 saving the earth知识精讲2 人教版

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1、高二英语Unit9Savingtheearth知识精讲人教版一.本周教学内容：Unit9Savingtheearth二.教学目标：Howtohelpstudentlearntosupportanopinion.三.教学重点与难点：1.Talkaboutnatureecology.2.Supportanopinion.3.Writeevaluation.+四.具体内容：BackgroundInformationNature：naturalresourceenergythelawsofnaturenatureprinti

2、ngconquernaturedrawfromnaturephysicalnatureEcology：ecologistanimalecologychemicalecologycoastecologycropecologyforestecologygrasslandecologyhumanecologyinsectecologyplantecologysenseecologyEnvironment：environmentalenvironmentalproblemspollutionhomeenvironmentbe

3、autifytheenvironmentgroundenvironmentnormalatmosphericenvironmentProtectTheOzoneLayerInthemiddleofwinter,whensnowisfallinginmanypartsoftheUnitedStates,scientistshavesoundedawarningtopeoplewhoplantospendhoursinthesunthissummer.Thewarning:Thesun’ssummertimeraysar

4、emoredangerousthanoncethought.Ateamofscientistsfrom80nationsrecentlyreportedtotheUnitedNationsthatalayerofozoneintheatomosphere,whichprotectshumansfromharmfullevelsofultravioletradiation,willbethinnerovertheUnitedStatesthissummer.Thethinneroverlayerallowsmoreul

5、travioletraysformthesuntoreachtheearth.Theextraamountofultravioletradiationcouldcauseanincreaseinthenumberofcasesofskincancer.PollutionPeopletodayallovertheworldarebeginningtolearnmoreabouttheproblemofpollution.Pollutioniscausedeitherbythereleaseofcompletelynew

6、andoftenartificialsubstancesintotheenvironment,orbyreleasinggreatlyincreasedamountsofanaturalsubstance,suchasoilfromoiltankersintothesea.Withthedevelopmentofmodernindustry,manyofthegoodsandmachinesweneedanduseinourdailylivesarecreatinganumberofwasteproductswhic

7、hupsettheenvironmentbalance.Thereisnodoubtthatmuchofthepollutioncausedcouldbecontrolledifonlycompanies,individualsandgovernmentwouldmakemoreefforts.Inthehomethereisanobviousneedtocontrollitterandwaste.SummaryTheEarthSummitisameetingheldbytheUnitedNationstodiscu

8、ssenvironmentalissues.ThefirstEarthSummitwasheldinSwedenin1972.In2002,theEarthSummitwasheldinJohannesburg,SouthAfrica.Oneofthemainthemeswas“sustainabledevelopment”.InJohanne