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1、★精品文档★关于环境污染的演讲稿LetmeshowyousomeofthemPopulationGrowthIncreasinglylargenumbersofpeoplearebeingaddedtotheworldeveryyear.Asthenumberofpeopleincreases,morepollutionisgenerated,morehabitatsaredestroyed,andmorenaturalresourcesareusedup.Evenifnewtechnologicalad
2、vanceswereabletocutinhalftheenvironmentalimpactthateachpersonhad,assoonastheworld’spopulationsizedoubled,theearthwouldbenobetteroffthanbefore.ThePopulationDivisionoftheUnitedNationspredictsthatthebillionhumansalivein1994willincreasetobillionintheyear2000,
3、billionin2025,andbillionin2050.Infact,becauselargeramountsofresourcesperpersonareusedinthedevelopednations,eachcitizenfromthedevelopedworldhasamuchgreaterenvironmentalimpactthandoesacitizenfromadevelopingcountry.GlobalWarmingThisprocessisreferredtoasthegr
4、eenhouseeffect.Thesegreenhousegases,primarilycarbondioxide,methane,nitrousoxide,insulate2016全新精品资料-全新公文范文-全程指导写作–独家原创7/7★精品文档★theearth’ssurface,helpingtomaintainwarmtemperatures.Iftheconcentrationofthesegaseswerehigher,moreheatwouldbetrappedwithintheatmos
5、phere,andworldwidetemperatureswouldrise.AirpollutionAsignificantportionofindustryandtransportationisbasedontheburningoffossilfuels,suchasgasoline.Asthesefuelsareburned,环境Likeallotherlivingbeings,humanshaveclearlychangedtheirenvironment,buttheyhavedonesoge
6、nerallyonagranderscalethanhaveotherspecies.Someofthesechanges-suchasthedestructionoftheworld’stropicalrainforeststocreategrazinglandforcattleorthedryingupofalmostthree-quartersoftheAralSea,oncetheworld’sfourth-largestfreshwaterlake,forirrigationpurposes-h
7、aveledtoalteredclimatepatterns,whichinturnhavechangedthedistributionofspeciesofanimalsandplants.Increasinglylargenumbersofpeoplearebeingaddedtotheworldeveryyear.Asthenumberofpeopleincreases,morepollutionisgenerated,morehabitatsaredestroyed,andmorenatural2
8、016全新精品资料-全新公文范文-全程指导写作–独家原创7/7★精品文档★resourcesareusedup.Evenifnewtechnologicaladvanceswereabletocutinhalftheenvironmentalimpactthateachpersonhad,assoonastheworld’spopulationsizedoubled,theearthwouldbenobetteroffthan
