全球变暖英文ppt课件

GlobalWarming11234BackgroundReasonProblemSolution目录CONTENT2Theclimatehasbeengettingsteadilywarmerandwarmerinrecentyears.Background13TheaverageglobaltemperaturerisessignificantlyafterenteringtheeightiesGlobalwarmingiscoming!!!!4Therearemanyreasonsoftheglobalwarming,butitmainlycausedbyhumanactivitiesReason25Initialcausesoftemperaturechanges3421AerosolsandsootGreenhousegasesVariationsinEarth'sorbitSolaractivity6Fossilfuelburningland-usechangePopulationgrowth1GreenhousegasesCO27Inadditiontotheirdirecteffectbyscatteringandabsorbingsolarradiation,aerosolshaveindirecteffectsontheEarth'sradiationbudget.2Aerosolsandsoot83SolaractivityThesun’activitiescausevolcaniceruption,andproducealargenumberofash94VariationsinEarth'sorbitVariationsinorbitalcyclesmayinitiateanewglacialperiodinthefuture,thoughthetimingofthisdependsongreenhousegasconcentrationsaswellastheorbitalforcing.10GlobalwarmingcausesallsortsofproblemsProblem311ExtremeweatherSealevelriseLong-termeffectsEcologicalsystems123412ExtremeweatherProjectionssuggestaprobableincreaseinthefrequencyandseverityofsomeextremeweatherevents,suchasheatwaves，Elnino（厄尔尼诺）,drought,floods,thunderstorms,hail（冰雹）,storm,theheatandduststorms13SeaLevelRise19thcentury——riseattherateof0.10to0.15peronehundredmetersIce,islands,citydisappearBringdisastertothecoastalareas14Terrestrial（陆地）ecosystemsthreatencoralreefs,fisheries,protectedspecies,andothernaturalresourcesofvaluetosocietyEffecttheflightofthemigratorybirdsaffectparticularecosystemsreduceddiversityofecosystemsoceanecosystem123Air15effectsLong-termAbruptclimatechangearesponsefromtheEarth'scrusttherapidreleaseofmethaneandcarbondioxidefrompermafrostinjuryandlossoflifealargerisktoglobalandregionalfoodsecurityEconomicandInfrastructureloss16LowcarbonlifeSolution417•Mitigation•Adaptation•ClimateengineeringMitigationofclimatereducegreenhousegasemissions,orenhancethecapacityofcarbonsinkstoabsorbGHGsfromtheatmosphereLocaladaptationeffortsEnhancingadaptivecapacityAgriculturalproductionMorespendingonirrigationWeathercontrolDammingglaciallakesGeoengineeringMigrationInsurancesolarradiationmanagementandcarbondioxideremoval.18谢谢大家观看ThanksForWatchingLOGO19