全球变暖英文教学课件.ppt

1、Global Warming 1 1234Background Reason Problem Solution 目录CONTENT2 The climate has been getting steadily warmer and warmer in recent years.Background 13 The average global temperature rises significantly after entering the eighties Global warming is coming!4 There are many reasons of the global warm

2、ing,but it mainly caused by human activitiesReason 25 Initial causes of temperature changes3 34 42 21 1Aerosols and sootGreenhouse gasesVariations in Earths orbitSolar activity6 Fossil fuel burning land-use changePopulation growth1 1Greenhouse gasesCO27 In addition to their direct effect by scatteri

3、ng and absorbing solar radiation,aerosols have indirect effects on the Earths radiation budget.2 2Aerosols and soot8 3 3Solar activityThe sun activities cause volcanic eruption,and produce a large number of ash9 4 4Variations in Earths orbitVariations in orbital cycles may initiate a new glacial per

4、iod in the future,though the timing of this depends on greenhouse gas concentrations as well as the orbital forcing.10 Global warming causes all sorts of problemsProblem 311 Extreme weather Sea level rise Long-term effects Ecological systems1 12 23 34 412 ExtremeweatherProjections suggest a probable

5、 increase in the frequency and severity of some extreme weather events,such as heat waves，Elnino（厄尔尼诺）（厄尔尼诺）,drought,floods,thunderstorms,hail（冰（冰雹）雹）,storm,the heat and dust storms13 Sea LevelRise19th century rise at the rate of 0.10 to 0.15 per one hundred metersIce,islands,city disappearBring dis

6、aster to the coastal areas14 Terrestrial（陆地）ecosystemsthreaten coral reefs,fisheries,protected species,and other natural resources of value to societyEffect the flight of the migratory birds affect particular ecosystems reduced diversity of ecosystems ocean ecosystem13Air 15 effects Long-termAbrupt

7、climate changea response from the Earths crustthe rapid release of methane and carbon dioxide from permafrostinjury and loss of lifea large risk to global and regional food securityEconomic and Infrastructure loss16 Low carbon lifeSolution 417 MitigationAdaptationClimate engineeringMitigation of cli

8、mate reduce greenhouse gas emissions,or enhance the 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.18 谢谢大家观看Thanks For WatchingLOGO19