global warming 全球变暖 英文课件

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1、WARMINGGLBALWHATISTHIS'GLOBALWARMING'??????HowGlobalWarmingWorksFossilfuels(coal,oil,naturalgas)CarbonDioxide(CO2)IncreaseintheaveragetemperatureofEarth'ssurface,airandoceans.Globalsurfacetemperatureincreased0.74±0.18 °C(1.33±0.32 °F)b/wthestart&theend

2、ofthe20thcentury.TheSun’senergypassesthroughthecar’swindshield.Thisenergy(heat)istrappedinsidethecarandcannotpassbackthroughthewindshield,causingtheinsideofthecartowarmup.ExampleoftheGreenhouseEffectWhat’sthedifferencebetween“globalwarming”and“climatec

3、hange”?CLIMATECHANGEisabroadertermthatreferstolong-termchangesinclimate,includingaveragetemperatureandprecipitation.GLOBALWARMINGistheincreaseoftheEarth’saveragesurfacetemperatureduetoabuild-upofgreenhousegasesintheatmosphere.DifferenceBUT,HOWDOWEKNOWT

4、HATTHEREISGLOBALWARMINGPortageGlacier19142004AlaskaColoradoRiverArizonaJune2002Dec2003Whendidglobalwarmingstart?GlobalAtmosphericConcentrationofCO2WhyisglobalWarminghappening?CAUSESOFGLOBALWARMINGGREENHOUSEGASESCFCsBURNINGOFFOSSILFUELSGasesintheatmosph

5、erethatabsorb&emitradiationwithinthermalinfraredrange.EmissionofCFCsfromrefrigerators&ACsresultsinozonedepletion.Fuelsformedbynaturalresources,theirburningproducesaround21.3billiontonesofCO2/yearHOWDOESGLOBALWARMINGAFFECTUS??????EFFECTSOFGLOBALWARMINGR

6、ISEINSEALEVELCurrentsealevelrisehasoccurredatarateof1.8mm/yearforthepastcentury.INCREASEDTEMPERATURETheglobaltemperatureinthelastcenturyhasrisenby0.74 °C±0.18 °C.HABITATDAMAGEIncreasedglobalwarminghasadverselyaffectedhabitatofmanyspeciesBUTHOWTOGLOBALW

7、ARMING?????WAYSTOREDUCEOUREMMISSIONSSOLARENERGYGenerationofelectricityfromsunlight.WINDENERGYPowerbymovingwindturbinesviafastwinds.FUELEFFICIENCYFormofthermalefficiencythatconvertschemicalenergyinacarrierfuelintowork.Wecanstopglobalwarming!WHATCANWEDOT

8、OSAVEOURPLANETSimpleThingsToDoTurnoffyourcomputerortheTVwhenyou’renotusingit.Takeshortershowers.Heatingwaterusesenergy.Keeproomscoolbyclosingtheblinds,shades,orcurtains.Turnoffthelightswhenyouleavearoom.Usecompactfluorescentbulbs.Simple