土地荒漠化英语Presentation

FightingagainstglobaldesertificationWangsiyuan,YangyuqinCaishuman,Juyeong01Introductionthereasonandtheimpact02TheexampleAsia03TheexampleAfica04ConclusionCONTENTSIntroductionthereasonandtheimpact010102HumanfactorDesertificationcanbecausedbytoomuchuseoflandandinappropriatemanagementofsoilinsemi-aridareas.NaturalfactorDesertificationcanbecausedbythedecreaseofrainfallandhightemperatureandotherselementsofclimate.THEREASONHumanbeingsOthersproblemsTHECURRENTIMPACTINTHEWORLDThelandAseriouslossofland“Thedesertificationareaintheworldisbetween6,000,000Km2and1,200,000Km2.”PART1AthreattohumanbeingsItisdifficultforpeopletoobtaincleandrinkingwaterandadequatesanitationmeasures,whichincreasestheprobabilityofdeteriorationoftheirhealthstatus.PART2OthersproblemsItalsohascausedothersenvironmentalproblemsandadverselyaffectedotherareasawayfromthedesertificationregion.PART302AsiaChinaInAsia,400millionpeopleliveindesertoraridlands,andtheareaofdrylandincreasesbyabout2,500squarekilometersannually.Chinaisoneofthecountrieswithseveredesertificationintheworld.Theannualdirecteconomiclossescausedbydesertificationdisastersamountto120billionyuan.Naturalfactors:drought,locationhumanfactors:Overreclamation,overgrazing,excessivelogging,irrationaluseofwaterresource,rapidpopulationgrowth(themostbasic)CausesofformationProtectexistingvegetationandstrengthenforestandgrassconstruction.Along-lastingecologicalrevolutionhasbeencarriedoutindesertificationareastoreversethedesertificationprocess.MeasuresReducedamagetothepasture.Controltherapidgrowthofthepopulationandcontinuouslyimprovethequalityofthepopulation.Industrialrestructuring.Strengtheninternationalexchangesandcooperationincombatingdesertification.03Africa•20,000hectaresperyear•319millionhectaresintotal•In1949,A.AubrevillethoughtthattheAfricantropicalforestlinehadreceded60-400km•1968-1974,aparticularlyseveredroughtintheSahararegionofAfrica,claimingthelivesof200,000peopleandmillionsofanimals.•1960s-1970s,aparticularlyseveredroughtinwesternAfricaacceleratedthedesertificationprocessintheregion.Whatisdesertification?aridareasofAfricahavebeengettingdrierforalmost5,000yearspoverty-relatedagriculturalpracticesareamajorcontributortodesertificationmostoftheaffectedcountriesarepoorcountries,andpublicinfrastructureconstructionisnotperfectWhatcausedthedertificationinAfrica?•Amongthe21countriesintheSaharanaridregion,morethan35millionpeoplewereaffectedduringthepeakdroughtinthe1980s,andmorethan10millionpeoplehavelefttheirhomestobecome“ecologicalrefugees”.Influences•over50millionpeoplecouldmovefromthedegradedareasofsub-SaharanAfricatoNorthAfricaandEuropeby2020.InfluencesPreservetropicalforest&agreeonagendaUsetechnologythatanalyzetheprocess,changeandinterrelationshipofotherfactorsthatassociatedwithdesertificationDevelopbreedsthatsuitswellindesertificationandhasadiversegenesthatcanprotecttropicalforestMeasures04Conclusion1.://