unit 3 the earth period 1 getting ready 课件

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1、Unit3Module2ThenaturalworldOxfordEnglishGettingreadyPeriod1TheEarth1brainstormingAnswerthequestionsaboutthepicture:1.Whatcanyouseeinthepicture?2.Whatdoyouthinktheydiscussedattheconference?Agirlandaboydirtyairandsmokepipe,wastewaterpollution2backgroundinformat

2、ionspaceearthsealand3FurtherreadingEnvironmentalProtectionEnvironmentisthethingsaroundthecenterofthingsThelawofEnvironmentalProtectionEnvironmentis:air,water,land,minerals,forestswildlife(野生动植物)aquaticflora,historicalsites,scenicareas,naturereserves,Whatishap

3、peningontheeartheverysecond●2.4Neonatesbornintheworld.●extracted28.6tonsofmetal.●produce1.3cars.●CO2emissionsof760tonsworldwide.●Decreaseof0.6squarekilometersforest.Theworld'stoptenenvironmentalproblems◆1.Globalwarming---全球变暖◆2.Ozonelayerdepletion---臭氧层破坏◆3.L

4、ossofbiodiversity---生物多样性减少◆4.Thespreadofacidrain---酸雨蔓延◆5.Forestdropped---森林锐减◆6.Desertification---土地荒漠化◆7.Airpollution---大气污染◆8.Waterpollution---水体污染◆9.Marinepollution---海洋污染NO.1Globalwarming◆Graduallyincreasingthegreenhouseeffect,Earth'stemperaturerising.◆

5、Mainhazards(危害):abnormalweather,speciesextinction,thesealevelrising.◆Ozone(O3)layer:theEarth'sprotectivelayer◆Mainhazards:strongUV(ultra-violetray紫外线)radiationcandamageimmunesystem（免疫系统）ofhumannaturesandanimals,causeskincancerandcataracts（白内障）,damagetotheeart

6、h’secosystems（全球生态系统）.NO.2OzonelayerdepletionNO.3LossofbiodiversityNO.4Thespreadofacidrain◆Globalextinctionof50,000species/year,140/dayonaverage.◆pH<5.6referredasacidrain.◆Mainhazards:Waterandsoilacidification(酸化),plantandanimaldeath,corrosion(腐蚀)buildings,ra

7、ilwaysandbridgesandotherfacilities.NO.5ForestdroppedNO.6Desertification◆Hugenumbersofglobaldeforestation.◆600millionsquarekilometersoflandintodeserteachyear.NO.7Airpollution◆Sulfideandnitrogenoxides(硫化物和氮氧化合物)intotheatmosphereworldwideupto30milliontonseachyea

8、r.NO.8Waterpollution◆About40%oftheworld’sriversareseriouslypolluted.◆Freshwater（淡水）resourcesarebecomingexhausted.NO.9MarinepollutionNO.10Cross-boundarymovementsofpoisonouswastes◆Hundredso