Globalwarming.docx
- 文档编号:27778184
- 上传时间:2023-07-05
- 格式:DOCX
- 页数:39
- 大小:51.40KB
Globalwarming.docx
《Globalwarming.docx》由会员分享,可在线阅读,更多相关《Globalwarming.docx(39页珍藏版)》请在冰豆网上搜索。
Globalwarming
第1页
Globalwarming
Meansurfacetemperatureanomaliesduringtheperiod2019to2019withrespecttotheaveragetemperaturesfrom1940to1980
GlobalwarmingistheincreaseintheaveragetemperatureoftheEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation.
Globalsurfacetemperatureincreased0.74±0.18°C(1.33±0.32°F)
duringthe100yearsendingin2019.[1][2]TheIntergovernmentalPanelonClimateChange(IPCC)concludesthatmostofthetemperatureincreasesincethemid-twentiethcenturyisverylikelyduetotheincreaseinanthropogenicgreenhousegasconcentrations.[3][2]Naturalphenomenasuchassolarvariationandvolcanoesprobablyhadasmallwarmingeffectfrompre-industrialtimesto1950andasmallcoolingeffectfrom1950onward.[4][5]Thesebasicconclusionshavebeenendorsedbyatleast30scientificsocietiesandacademiesofscience,[6]includingallofthenationalacademiesofscienceofthemajorindustrializedcountries.[7][8][9]
Whileindividualscientistshavevoiceddisagreementwiththese
findings,[10]theoverwhelmingmajorityofscientistsworkingonclimatechangeagreewiththeIPCC'smainconclusions.[11][12]
Climatemodelprojectionsindicatethatglobalsurfacetemperaturewilllikelyriseafurther1.1to6.4°C(2.0to11.5°F)duringthetwenty-firstcentury.[3]Theuncertaintyinthisestimatecomesaboutfromdifferingestimatesoffuturegreenhousegasemissionsandfromtheuseofmodelswithdifferingclimatesensitivity.Anotheruncertaintyishowwarmingandrelatedchangeswillvaryfromregiontoregionaroundtheglobe.Althoughmoststudiesfocusontheperiodupto2100,warmingisexpectedtocontinueformorethanathousandyearsevenifgreenhousegaslevelsarestabilized.Thisresultsfromthelargeheatcapacityoftheoceans.[3]
Increasingglobaltemperaturewillcausesealevelstoriseandwillchangetheamountandpatternofprecipitation,likelyincludinganexpanseofthesubtropicaldesertregions.[13]Otherlikelyeffectsincludeincreasesintheintensityofextremeweatherevents,changesin
agriculturalyields,modificationsoftraderoutes,glacierretreat,speciesextinctionsandincreasesintherangesofdiseasevectors.MostnationalgovernmentshavesignedandratifiedtheKyotoProtocolaimedatreducinggreenhousegasemissions.Politicalandpublicdebate
第2页
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- Globalwarming