高二英语unit9 saving the earth知识精讲 人教版

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1、高二英语Unit9Savingtheearth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：naturalresourceenergythelawsofnaturenatureprintingconquernaturedrawfromnaturephysicalnat

2、ureEcology：ecologistanimalecologychemicalecologycoastecologycropecologyforestecologygrasslandecologyhumanecologyinsectecologyplantecologysenseecologyEnvironment：environmentalenvironmentalproblemspollutionhomeenvironmentbeautifytheenvironmentgroundenvironmentnormalatmosphericenvironmentProtectT

3、heOzoneLayerInthemiddleofwinter,whensnowisfallinginmanypartsoftheUnitedStates,scientistshavesoundedawarningtopeoplewhoplantospendhoursinthesunthissummer.Thewarning:Thesun’ssummertimeraysaremoredangerousthanoncethought.Ateamofscientistsfrom80nationsrecentlyreportedtotheUnitedNationsthatalayerof

4、ozoneintheatomosphere,whichprotectshumansfromharmfullevelsofultravioletradiation,willbethinnerovertheUnitedStatesthissummer.Thethinneroverlayerallowsmoreultravioletraysformthesuntoreachtheearth.Theextraamountofultravioletradiationcouldcauseanincreaseinthenumberofcasesofskincancer.PollutionPeop

5、letodayallovertheworldarebeginningtolearnmoreabouttheproblemofpollution.Pollutioniscausedeitherbythereleaseofcompletelynewandoftenartificialsubstancesintotheenvironment,orbyreleasinggreatlyincreasedamountsofanaturalsubstance,suchasoilfromoiltankersintothesea.Withthedevelopmentofmodernindustry,

6、manyofthegoodsandmachinesweneedanduseinourdailylivesarecreatinganumberofwasteproductswhichupsettheenvironmentbalance.Thereisnodoubtthatmuchofthepollutioncausedcouldbecontrolledifonlycompanies,individualsandgovernmentwouldmakemoreefforts.Inthehomethereisanobviousneedtocontrollitterandwaste.Summ

7、aryTheEarthSummitisameetingheldbytheUnitedNationstodiscussenvironmentalissues.ThefirstEarthSummitwasheldinSwedenin1972.In2002,theEarthSummitwasheldinJohannesburg,SouthAfrica.Oneofthemainthemeswas“sustainabledevelopment”.InJohannesburg,e