人教新课标选修六Unit4-Global-warming-Warming-up-&-Reading[课件]-3.ppt

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1、Unit4---warmingupandreadingGlobalwarmingExtremeheat酷暑Canyouthinkofsomenaturaldisasters(自然灾害)becauseoftheextremeheat?drought(旱灾)firefloodhurricane/typhoonIfeelhot!.×√Low-carbonlife（低碳生活）Isthewholeworldbecomingwarmerandwarmer?Why?populationairpollution…carbondioxideacidrainspeciese

2、xtinctionwaterpollution全球气候变暖是一种“自然现象”。人们焚烧化石矿物以生成能量或砍伐森林并将其焚烧时会产生二氧化碳等多种温室气体。这些温室气体对来自太阳辐射的可见光具有高度的透过性，而对地球反射出来的长波辐射具有高度的吸收性，能强烈吸收地面辐射中的红外线，导致全球气候变暖，也就是常说的“温室效应”。全球变暖会使全球降水量重新分配、冰川和冻土消融、海平面上升等，既危害自然生态系统的平衡，更威胁人类的食物供应和居住环境。energysourcesWedependonenergytodomanythingsinourdailylive

3、s.Forexample,energylightsourcitiesandheatsourbuildings.Makealistofthingsthatuseenergyinyourhome,inyourschool,oranyotherplacesyoucanthinkof.stovelightthingsthatuseenergyinyourhomemicro-waveovencassetteplayerheatingtelevisionhairdryervideoplayerfridgecomputerwashingmachinestoveWind

4、energyisusedaspowertoproduceelectricity.Windmillswhereelectricityisproducedbyburningcoals.Thecoalpowerstationsinwhichoilisrefinedandmadepure.TheOilRefineriestochangenuclearenergyintoelectricity.Anuclearpowerplantontheroofofahouseonabrightsunnydayareusedtocollectsolarenergy,making

5、yourhousewarmorheatingyourwater.SolarpanelsTheHydro-electricdamsareusedtokeepbackwaterandraiseitslevelforirrigationorforproducingelectricity,etc.Anenergysourceis“renewable”whensuppliesofitneverrunoutand“non-renewable”whenonedaytheywillrunout.Whichenergysourcesonyourlistarerenewab

6、leandwhicharenon-renewable?DiscussSourcesofenergyRenewable/non-renewablecoaloilnaturalgaswind(windpower)sun(solarenergy)nuclearenergywater(hydro-electricpower)thesea(tidalenergy)non-renewablenon-renewablenon-renewablerenewablerenewablenon-renewablerenewablerenewablePre-readingWha

7、tisthegreenhousemadeandusedfor?greenhouseTheyaremadeofglassandplantscangrowinitwhenitiscoldoutside.Howdoesitwork?Theglasstrapstheheatfromthesun,makingtheairwarmsothatplantscangrowbetter.Greenhousegases!What’sgreenhousegaseseffect?Greenhousegasesperformthesamefunctionastheglassina

8、greenhouse---Theytraptheheatofthesunandk