【急!求一篇初中英语演讲稿,题材活泼一点的,不超过3分钟,最-查字典问答网
分类选择

来自陈维军的问题

  【急!求一篇初中英语演讲稿,题材活泼一点的,不超过3分钟,最好可以加上动作的.与众不同一点哦.谢谢】

  急!求一篇初中英语演讲稿,题材活泼一点的,不超过3分钟,最好可以加上动作的.

  与众不同一点哦.谢谢

1回答
2020-01-16 08:33
我要回答
请先登录
舒适

  Scientistsfoundthatclimatechangebecamemoreandmoreunusualinrecentyears,notonlymayitcausemanyproblemssuchasglobalwarming,naturecalamities,andsoon,butalsoitcanaffectyourlife.Unusualclimatechangewouldletyoufeeluncomfortable,andaffectyourstudyandwork.Therefore,everyonehasresponsibilitytopayattentiontoit;furthermore,youneedtodoeverythinginyourpowertomaketheclimatebetterandbetter.However,atfirst,youneedtounderstandtwothings:themeaningofclimatechange,andtwoimportantfactorsofclimatechange:naturalcauses,andhumancauses.Thisessayisgoingtotalkaboutthesetwothings.

  Atfirst,youmustunderstandthemeaningofclimatechange.Itmeansanylong-termsignificantchangeintheaverageweather,whichmayincludeaveragetemperature,precipitation,windpatternsandsoon.Forexample,Australiaisexperiencingrapidclimatechange.Sincethemiddleofthetwentiethcentury,Australiantemperatureshaverisenbyaboutaverageonetemperaturedegreewithanincreaseinthefrequencyofheatwavesandadecreaseinthenumbersoffrostsandcolddays.Rainfallpatternshavealsochanged,whichmeansthatthenorthwesthasseenanincreaseinrainfalloverthelastfiftyyearswhilemuchofeasternAustraliaandthefarsouthwesthaveexperiencedadecline.Fromthisexample,itindicatesclimatechangethatisoccurringtodayhasspedup,andaffectslong-termweather.TheEarth’sclimateislargelyaffectedbyhowmuchheatisstoredintheatmosphere.Furthermore,theclimatechangeiscausedbydynamicprocessonEarth,externalforcesincludingvariationsinsunlightintensity,andmorerecentlybyhumanactivities.

  Themostimportantreasonofclimatechangeiscausedbyhumans,becausehumansproducealotofcarbondioxideintotheair.Thiscarbondioxideemitsfromfossilfuel,aerosols,cementmanufacture,landuse,animalagricultureanddeforestation.Forexample,treescantakeincarbondioxidetoproduceoxygenbyphotosynthesis.Ifpeoplecutmanytreesformakingfurniture,paper,orsellwoodtomakemoney,thereismuchmorecarbondioxideintheair.Beginningwiththeindustrialrevolutioninthenineteenthcenturyandacceleratingeversince,thehumanconsumptionoffossilfuelshasraisedcarbondioxidelevelsrapidly.Itmeansthatcarbondioxidelevelsaresubstantiallyhighernowthanbefore.Ontheotherhand,duringtheprocedureofmanufacturingcement,whichisusedinbuildings,significantlymorecarbondioxideisproduced.Whilepeopleimprovetheirlivingstandard,theycauseclimatechange.Whenpeopleburncoal,oil,andgasforourelectricity,carbondioxideisproduced.Whenpeopleburnfossilfueltomovevehicles,carbondioxideisalsoproduced.Thesesortsofexamplesindicatethathumansaretherealculprit.Theydonotconsidertheconsequence,whiletheyenjoyproducingeverythingtheywant.

  Itisnotjustman-madepollutionoftheatmospherewhichcancauseclimatechange.ChangesintheamountofcarbondioxideintheairhaveoccurrednaturallyduringthehistoryoftheEarth,leadingtoclimatechanges.Whenavolcanoerupts,itreleaseshugeamountsofcarbondioxideandsulfurdioxideintotheatmosphere.However,volcanoeruptionscannoteffectclimatechange.Themainreasonisthatbeforethevolcanoerupts,itwouldreleasehugeamountofcarbondioxideandsulfurdioxideforaverylongtime.Thispollutioninjectedin

2020-01-16 08:38:51

最新问答

推荐文章

猜你喜欢

附近的人在看

推荐阅读

拓展阅读

  • 大家都在看
  • 小编推荐
  • 猜你喜欢
  •