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1、Clean Waters and Green Mountains2.4 Climate ChangeGreen ChinaGreen ChinaObjectivesLearnthebasicknowledgeofClimateChange01Befamiliarwitheffortsdonetoprotecttheenvironmentfromclimatechange02industrialplantschoppingdowntreessoildepletionairpollutionIf we dont protect the nature,we cant protect ourselve
2、sClimate ChangeClimate changeisdefinedasalongtermchangeintheEarthsoveralltemperaturewithmassiveandpermanentramifications.Theearthstemperaturedependsonthebalancebetweenenergyenteringandleavingtheplanetssystem.Climate Change1、Whensunlightreachestheearthssurface,itcaneitherbereflectedbackintospaceorabs
3、orbedbytheearth.2、Incomingenergythatisabsorbedbytheearthwarmstheplanet.Onceabsorbed,theplanetreleasessomeoftheenergybackintotheatmosphereasheat.3、Solarenergythatisreflectedbacktospacedoesnotwarmtheearth.4、Certaingasesintheatmosphereabsorbenergy,slowingorpreventingthelossofheattospace.Thosegasesarekn
4、ownas“greenhousegases”.Climate ChangeuAlittlegreenhouseeffectisnaturaltotheearthandisagoodthingtohave,thegasesactlikeablanket,makingtheearthwarmerthanitwouldotherwisebe.uButalargegreenhouseeffectcanbecatastrophiccausingalotofthatenergytostayinouratmosphereandheatuptheearthatanacceleratingrate.Climat
5、e ChangeKeygreenhousegases:CarbonDioxideMethaneNitrousOxidesGround-LevelOzoneWaterVaporAerosolsCFCsClimate ChangeSincetheIndustrialRevolution,humanactivitieshavereleasedlargeamountsofcarbondioxideandothergreenhousegasesintotheatmosphere.Naturalprocesses,suchaschangesinthesunsenergyandvolcaniceruptio
6、ns,alsoaffecttheearthsclimate.Climate ChangeuOurcivilizationsproducedadevastating40billiontonsofcarbondioxideinoneyear.ItsenoughtofilltheentireGrandCanyonfivetimesoritstheequivalentof19millionEmpireStatebuildings.Climate ChangeuSomeofthemainhumanactivitythatamidstgreenhousegasesarefossilfuelburning,
7、animalagriculture,anddeforestation.Effects of Climate ChangeuTheearthstemperaturehasrisen1.5degreesFahrenheitoverthepastcenturyandisprojectedtoriseanother0.5to8.6degreesFahrenheitoverthenext100years.uOceanacidificationharmsanimallifeandiswhatscausingthedeathoftheGreatBarrierReef.Sincetheoceansarebec
8、omingwarmerthepolaricecapsaremeltingwhichhascausedalmost65percentofthepolaricecapstomelt.Effects of Climate ChangeuSince1979theearthlosesonaverage400billiontonsoficeeachyear,thatslikeagiantblockofice4mileslongoneachside,64cubicmilesthatmeltsandisaddedtotheocean.Effects of Climate ChangeuClimatechang
9、ealsocausesmorefrequentandintensenaturaldisasterssuchashurricanesfloodstornadoesheatwavesanddroughts.Effects of Climate ChangeWorlds efforts to fight climate changeuThe2021UnitedNationsClimateChangeConference,morecommonlyreferredtoasCOP26,washeldinGlasgow,Scotland,UnitedKingdom,from31Octoberto13Nove
10、mber2021.COP26wasthemomentcountriesrevisitedtheclimatepledgesmadeunderthe2015ParisAgreement.uTwenty-fivethousanddelegatesfromnearly200countrieswereexpectedtoattend.Anewglobalagreement-theGlasgowClimatePact-wasreachedattheCOP26summit.Theagreement-althoughnotlegallybinding-settheglobalagendaonclimatec
11、hangeforthenextdecadelThe Glasgow Climate Pact The Glasgow Climate PactWorlds efforts to fight climate changeThepactReaffirmstheParisAgreementtemperaturegoalofholdingtheincreaseintheglobalaveragetemperaturetowellbelow2Candpursuingeffortstolimitthetemperatureincreaseto1.5C.Over140countriespledgedtore
12、achnet-zeroemissions.Thisincludes90%ofglobalGDP.lEmissionsWorlds efforts to fight climate changeForthefirsttimeataCOPconference,anexplicitplanwasmadetoreducetheuseofcoal-whichisresponsiblefor40%ofannualCO2emissions.lCoalWorlds efforts to fight climate changeLeadersfrommorethan100countries-withabout8
13、5%oftheworldsforests-promisedtostopdeforestationby2030.Thisisseenasvital,astressabsorbvastamountsofCO2.lTreesWorlds efforts to fight climate changeAschemetocut30%ofmethaneemissionsby2030wasagreedbymorethan100countries.lMethaneWorlds efforts to fight climate changeuChinahascommittedtopeakcarbondioxid
14、eemissionsbefore2030andachievecarbonneutralitybefore2060.Companiesintheconstruction,transportation,andironandsteelsectorsshouldplayaleadingroleinthetransition.Forexample,thetransportationsector,whichemittedabout1billionmetrictonsofcarbonneedstofindalternativefuelsandimproveenergyefficienttechnology.
15、Worlds efforts to fight climate changeWorlds efforts to fight climate changeuThereisnoone-size-fits-allapproachtostoppingorslowingglobalwarming,andeachindividual,business,municipal,state,tribal,andfederalentitymustweightheiroptionsinlightoftheirownuniquesetofcircumstances.References1.https:/www.epa.
16、gov/climate-change2.USGCRPChapter32017Figure3.1panel23.https:/unfccc.int/process-and-meetings/the-paris-agreement/the-glasgow-climate-pact-key-outcomes-from-cop26Task1.Fromthevideo,trytoanswerthefollowingquestions:WhatisthedifferencesbetweenCO2fromnowthanitwasin1920s?Whatishappeningtotherainforest?Whatwouldhappeniftheozonelayerdisappears?2.Finishthetaskintheattachedworddocument.