global-warming

PPT模板下载：行业PPT模板：节日PPT模板：素材下载：背景图片：图表下载：优秀PPT下载：教程：教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：:Wheremanplantshisfoot,theharmoniesofnatureareturnedtodiscords.(P19“DestructivenessofMan”paragrahp2line6th)Toalesserextent,theclearingoflandforagriculture,industry,andotherhumanactivitieshasincreasedconcentrationsofgreenhousegases.（“CausesofClimateChanges”paragraph7）Indigenousvegetableandanimalspeciesareextirpated,andsupplantedbyothersofforeignorigin,spontaneousproductionisforbiddenorrestricted,andthefaceoftheEarthiseitherlaidbareorcoveredwithanewreluctantgrowthofvegetableforms,andwithalientribesofanimallife.(P19“DestructivenessofMan”paragrahp2line9th)extirpatev.消灭，根除supplantv.代替reluctantadj.犹豫的Thewanderingsavagegrowscultivatedvegetable,fellsnoforest,andextirpatesnousefulplant,nonoxiousweed.(P21“DestructivenessofMan”paragrahp7line6th)noxiousadj.有毒的Hehasfelledtheforestswhosenetworkoffibrousrootsboundthemouldtotherockyskeletonoftheearth,buthadallowedhereandthereabeltofwoodlandtoreproduceitselfbyspontaneouspropagation.(P21“DestructivenessofMan”paragrahp7line9th)fellv.砍伐fibrousadj.纤维的mouldn.模型propagationn.繁殖，增产Theclearingoflandforagriculture.IndustryOverthelastcenturytheburningoffossilfuelslikecoalandoilhasincreasedtheconcentrationofatmosphericcarbondioxide(CO2).（“CausesofClimateChanges”paragraph7）Hundredsofscientistsaroundtheworldhaveconductedresearchthatshowhumanactivitiescontributethemosttotoday’sclimatechange.WearechangingtheEarth’satmospherebyemittinghugeamountsofgreenhousegasessuchascarbondioxide,mostofwhichcomesfromtheburningoffossilfuels.Otherhumanactivitiesincludeagricultureandchangesinland-usepatterns.TheyallworktotiptheEarth’senergybalancebytrappingmoreheat.AnuradhaK.Herath.,2011,“TheClimateChangeDebate:Manvs.Nature,”AstrobiologyMagazine,Para20thLine1-7.Retrievedfrom:“Globalwarming:Anaturalcycleorhumanresult?”CNN,Para35thLine1-3Retrievedfrom:edition.cnn.com/2007/TECH/science/07/11/globalwarming.overview/index.htmlIPCC:IntergovernmentalPanelonClimateChange政府间气候变化专门委员会TheIPPCFAQpagesincludethisstatement:Sincethestartoftheindustrialera(about1750),theoveralleffectofhumanactivitiesonclimatehasbeenawarminginfluence.Thehumanimpactonclimateduringthiseragreatlyexceedsthatduetoknownchangesinnaturalprocesses,suchassolarchangesandvolcaniceruptions.”Isglobalwarminganaturaloccurrence?”Para17thLine1-6Retrievedfrom::IntergovernmentalPanelonClimateChange政府间气候变化专门委员会FAQ(FrequentlyAskedQuestions)常见问答集2Topicsentence:Themaincauseofthecurrentglobalwarmingtrendishumanexpansionofthegreenhouseeffect“(“causesofclimatechanges”para.1)(P19“DestructivenessofMan”paragrahp2line6th)Watervapor（水蒸气）:respondphysicallyorchemicallytochangesintemperatureareseenasfeedbacks“andthemostabundantgreenhousegas.Carbondioxide(CO2):Aminorbutveryimportantcomponentoftheatmosphere(“causesofclimatechanges”para.1，2，3)Evidence:theheatingeffectofthewatervaporarestrongenough,itisequaltothecarbondioxideintheatmospherecausingtheglobalwarmingeffectstrengthened.Scientistsusethenewmeansofobservation,throughexperimentalverification:existingclimatemodelishowtoaffectglobalwarming.Theplanet'saveragesurfacetemperaturehasrisenabout1.62degreesFahrenheit(0.9degreesCelsius)sincethelate19thcentury,achangedrivenlargelybyincreasedcarbondioxideandotherhuman-madeemissionsintotheatmosphere.(“evidenceofclimatechanges”para.3)CONCLUSIONThere'sabetterthan95percentprobabilitythathuman-producedgreenhousegaseshavecausedmuchoftheobservedincreaseinEarth'stemperaturesoverthepast50years.(“causesofclimatechanges”para.9)3Topicsentence:Severallinesofevidenceshowthatcurrentglobalwarmingcannotbeexplainedbychangesinenergyfromthesun(“CausesofClimateChanges”paragrahp10)ThesunplayaroleinclimatechangesThesunisthefundamentalsourceofenergythatdrivesourclimatesystem.Indeed,studiesshowthatsolarvariabilityhasplayedaroleinpastclimatechanges.Forexample,adecreaseinsolaractivityisthoughttohavetriggeredtheLittleIceAgebetweenapproximately1650and1850,whenGreenlandwaslargelycutoffbyicefrom1410tothe1720sandglaciersadvancedintheAlps(“CausesofClimateChanges”paragrahp10)ButitisnotthemainreasonandevidencetoprovethatIfthewarmingwerecausedbyamoreactivesun,thenscientistswouldexpecttoseewarmertemperaturesinalllayersoftheatmosphere.Instead,theyhaveobserv