1、1Global Warming 21234Background Reason Problem Solution 目录目录CONTENT3The climate has been getting steadily warmer and warmer in recentyears.Background 14The average global temperature rises significantly after entering the eighties Global warming is coming!5There are many reasons of the global warmin
2、g,but it mainly caused by human activitiesReason 26Initial causes of temperature changes3421Aerosols and sootGreenhouse gasesVariations in Earths orbitSolar activity7Fossil fuel burningland-use changePopulation growth1Greenhouse gasesCO28In addition to their direct effect by scattering and absorbing
3、 solar radiation,aerosols have indirect effects on the Earths radiation budget.2Aerosols and soot93Solar activityThe sun activities cause volcanic eruption,and produce a large number of ash104Variations in Earths orbitVariations in orbital cycles may initiate a new glacial period in the future,thoug
4、h the timing of this depends on greenhouse gas concentrations as well as the orbital forcing.11Global warming causes all sorts of problemsProblem 312Extreme weatherSea level riseLong-term effectsEcological systems123413ExtremeweatherProjections suggest a probable increase in the frequency and severi
5、ty of some extreme weather events,such as heat waves，Elnino（厄尔尼诺）,drought,floods,thunderstorms,hail（冰雹）,storm,the heat and dust storms14Sea LevelRise19th century rise at the rate of 0.10 to 0.15 per one hundred metersIce,islands,city disappearBring disaster to the coastal areas15Terrestrial（陆地）ecosy
6、stemsthreaten coral reefs,fisheries,protected species,and other natural resources of value to societyEffect the flight of the migratory birdsaffect particular ecosystemsreduced diversity of ecosystemsocean ecosystem123Air 16effectsLong-termAbrupt climate changea response from the Earths crustthe rap
7、id release of methane and carbon dioxide from permafrostinjury and loss of lifea large risk to global and regional food securityEconomic and Infrastructure loss17Low carbon lifeSolution 418?Mitigation?Adaptation?Climate engineeringMitigation of climate reduce greenhouse gas emissions,or enhance the
8、capacity of carbon sinks to absorb GHGs from the atmosphereLocal adaptation effortsEnhancing adaptive capacityAgricultural productionMore spending on irrigationWeather controlDamming glacial lakesGeoengineeringMigrationInsurancesolar radiation management and carbon dioxide removal.19谢谢大家观看谢谢大家观看Thanks For WatchingLOGO
