Unit4GlobalwarmingPartOne:TeachingDesign(第一部分：教学设计)Period1:Asamplelessonplanforreading(THEEARTHISBECOMINGWARMER—BUTDOESITMATTER?)AimsTolookandlistsourcesofenergyToreadaboutglobalwarmingProceduresI.WarmingupWarmingupbydefiningHello,everyone.Todaywearegoingtoreadaboutglobalwarming.Butfirstlet’sthinkaboutwhatmovestheworldaround.Yes,itisenergy.Butwhatisenergy?Renewableenergysourceslikewindpowerdon'temitcarbondioxide.Energyisafundamentalquantitythateveryphysicalsystempossesses;itallowsustopredicthowmuchworkthesystemcouldbemadetodo,orhowmuchheatitcanproduceorabsorb.Inthepast,energywasdiscussedintermsofeasilyobservableeffectsithasonthepropertiesofobjectsorchangesinstateofvarioussystems.Basically,ifsomethingchanges,somesortofenergywasinvolvedinthatchange.WarmingupbyobservingEnergyissoimportant,butwheredoesitcomefrom?Therearedifferentformsofenergy:▲Lightenergy光能▲Heatenergy热能▲Soundenergy声能▲Chemicalenergysource化学能源▲Nuclearenergy核能▲Internalenergy内能用心爱心专心116号编辑▲Kineticenergy动能▲Potentialenergy势能能源类型定义实例一次能源直接来自自然界而未经加工转换的能源化石燃料、太阳能、核能、生物燃料、水能等二次能源由一次能源直接或间接转化而来的能源电能、煤气、汽油、沼气、氢能等可再生能源不随其本身的转化或被人类利用而减少的能源太阳能、生物能、水能、风能、地热能等非再生能源随其本身的转化或被人类利用而减少的能源化石燃料、核燃料等Energyismeasuredinjoules(J).Energycandowork.Whenenergychangesfromoneformtoanother,theamountofenergystaysthesame.Energycannotbemadeordestroyed.Thisfactiscalled“conservationofenergy”.Mattercanbemadeintoenergythroughprocesseslikenuclearfissionandnuclearfusion.II.Pre-reading1.QuestioningandansweringHaveyoueverseenagreenhouse?Whatisit?Whatisitfor?LiHongju,couldyoutelltheclassinEnglishwhatyouknowaboutagreenhouse?Agreenhouseisbuiltofglasstobeusedforgrowingplants.Theairinsidethegreenhouseiswarmbecausetheglassletsinthesunandkeepsitfromrunningaway.Sotheairinsideiswarmandisgoodforgrowingplantsthroughoutthecoldseasons.2.TalkingandsharingNowlookatthewordGREENHOUSEGASES.Whatdoesitmean?Greenhousegases(GHG)aregaseouscomponentsoftheatmospherethatcontributetothegreenhouseeffect.Themajornaturalgreenhousegasesarewatervapor,whichcausesabout36-70%ofthegreenhouseeffectonEarth(notincludingclouds);carbondioxide,whichcausesbetween9-26%;andozone,whichcausesbetween3-7%(notethatitisnotreallypossibletoassertthatsuch-and-suchagascausesacertainpercentageoftheGHE,becausethe用心爱心专心116号编辑influencesofthevariousgasesarenotadditive.Thehigherendsoftherangesquotedareforthegasalone;thelowerend,forthegascountingoverlaps).Naturallyoccuringgreenhousegasesincludewatervapor,carbondioxide,methane,nitrousoxide,andozone.Certainhumanactivities,however,addtothelevelsofmostofthesenaturallyoccurringgases.Verypowerfulgreenhousegasesthatarenotnaturallyoccurringincludehydrofluorocarbons(HFCs),perfluorocarbons(PFCs),andsulfurhexafluoride(SF6),whicharegeneratedinavarietyofindustrialprocesses.Eachgreenhousegasdiffersinitsabilitytoabsorbheatintheatmosphere.HFCsandPFCsarethemostheat-absorbent.III.ReadingReadingaloudtotherecordingNowpleaselistenandreadaloudtotherecordingofthetextTHEEARTHISBECOMINGWARMER—BUTDOESITMATTER?Payattentiontothepronunciationofeachwordandthepauseswithineachsentence.Iwillplaythetapetwiceandyou’llreadaloudtwice,too.世界初级能源消耗能源石油煤可燃气水能核能百分...
