B6Unit 4 Global warming[全套课件].ppt

《B6Unit 4 Global warming[全套课件].ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Unit4GlobalWarmingSavetheearth!Period1&2WarmingupandReadingIWorkingroups---listthingsasrequired:1.Thingsthatuseenergyaroundusoratanyotherplaces,(ie.light)2.Sourcesofenergy(ie.coal)Warmingup–I(３m)Thingsthatuseenergyaroundusoratanyotherplaces:InahouseThingsthatuse

2、energySourcesofenergylightstelevisioncassetteplayercomputerfridgestovewashingmachinehairdryervideorecordercoaloilnaturalgaswind(power)sun(solarenergy)water(hydro-electricpower)thesea(tidalenergy)uranium(nuclearenergy)plantwaster(biomassenergy)Windmills,renewable

3、.What?Renewable?Warmingup–II(5m)What?Whatkind?Renewable?Acoalpowerstation,non-renewable.What?Whatkind?Renewable?Anoilrefinery(精炼厂),non-renewable.What?Whatkind?Renewable?Anuclearpowerplant,non-renewable.What?Whatkind?Renewable?Ahydro-electricdam,renewable.Geother

4、mal(地热的)EnergyPlantCoalOilNaturalgasUraniumWind(windpower)Sun(solarenergy)Water(hydro-electricpower)Plantwaste(biomassenergy)Hotspringsorgeysers(geothermalenergy)Thesea(tidalenergy)FossilfuelsNon-renewableRenewableWhatarefossilfuels?Ancientanimalandplantmaterial

5、belowthesurfaceoftheearthwithahighcarboncontent,suchascoal,oilandnaturalgas,whichcanbeburnttoproduceenergy.Alsoknownasnon-renewableenergybecauseoncetheyareusedtheyhavegoneforever;theycannotberenewed.Whatabouttheweather?9℃/14℃Weneed…Pre-reading(3m)Thesun.Howabout

6、theplants?Iflackofsolarenergy,theplants…GreenhouseGreenhousegases!Whataregreenhousegases?What’sgreenhouseeffect?Let’sseethefollowingpictureaboutit.GlobalWarmingReadingReadthepassageagaintofindouttheanswerstothequestionsinEx.1ReadingI–scanning(5m)1.Whowrotethemag

7、azinearticle?Whatisthenameofthemagazine?2.Whatarethenamesofthethreescientistsmentionedinthearticle?→SophieArmstrong,EarthCare.→DrJaniceFoster,CharlesKeeling,GeorgeHambley.→Therearesomeverydifferentattitudesamongscientiststowardsthisissue.Somethinktheeffectswillb

8、eterrible,whilesomeothersbelievethatweshouldnotworryaboutit.3.Whatdotheythinkaboutglobalwarming?Dotheyagreewithoneanother?→Thefirstgraphshowsthetemperatureincreaseofo