高中英语Unit4 Global warming文章 The Greenhouse Effect 1人教版选修六VIP免费

ThegreenhouseeffectThegreenhouseeffectistheriseintemperaturethattheEarthexperiencesbecausecertaingasesintheatmosphere(watervapor,carbondioxide,nitrousoxide,andmethane,forexample)trapenergyfromthesun.Withoutthesegases,heatwouldescapebackintospaceandEarth’saveragetemperaturewouldbeabout60ºFcolder.Becauseofhowtheywarmourworld,thesegasesarereferredtoasgreenhousegases.Haveyoueverseenagreenhouse?Mostgreenhouseslooklikeasmallglasshouse.Greenhousesareusedtogrowplants,especiallyinthewinter.Greenhousesworkbytrappingheatfromthesun.Theglasspanelsofthegreenhouseletinlightbutkeepheatfromescaping.Thiscausesthegreenhousetoheatup,muchliketheinsideofacarparkedinsunlight,andkeepstheplantswarmenoughtoliveinthewinter.TheEarth’satmosphereisallaroundus.Itistheairthatwebreathe.Greenhousegasesintheatmospherebehavemuchliketheglasspanesinagreenhouse.SunlightenterstheEarth'satmosphere,passingthroughtheblanketofgreenhousegases.AsitreachestheEarth'ssurface,land,water,andbiosphereabsorbthesunlight’senergy.Onceabsorbed,thisenergyissentbackintotheatmosphere.Someoftheenergypassesbackintospace,butmuchofitremainstrappedintheatmospherebythegreenhousegases,causingourworldtoheatup.用心爱心专心Thegreenhouseeffectisimportant.Withoutthegreenhouseeffect,theEarthwouldnotbewarmenoughforhumanstolive.Butifthegreenhouseeffectbecomesstronger,itcouldmaketheEarthwarmerthanusual.Evenalittleextrawarmingmaycauseproblemsforhumans,plants,andanimals.用心爱心专心