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《Harmony with the environment 生态环境概论 英语论文》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、Peoplearoundtheworldmayfeelthattheclimatehasbeengettingsteadilywarmerandwarmerinrecentyears.Placeswhichusedtobeabundantinsnowfallhavefrequentlyexperiencedno-snowwinters.Droughtlastslongerinsomedryareas.Peoplefindthatwithoutairconditionerstheycouldhardlyworkorfallasleeponhottersummerdays.Thesidee
2、ffectsofglobalwarmingarealarming.Awarmerglobalclimatemeltstheicecaps,raisingsealevels.Whatismore,itdisturbsweatherpatterns,causingdroughts,severestorms,hurricanes(飓风).Peoplesufferalotfromdisastersrelevanttoglobalwarming.Howeverglobalwarmingismainlyduetohumanactivities,suchasgreenhousegasesgenera
3、tedbyindustrialproductionofnitrogenoxidesandcarbondioxide.Iftheatmosphereintheabsenceofsuchgases,theEarthwillbecometoocoldandnotsuitableforbiologicalsurvival.Intheatmosphereofgreenhousegaseshaveacertainthingisonlynaturalthatsomepeoplebelievethatthereisevidencethatevenintheabsenceofhumanimpact,we
4、willenteranothericeage.Butourconcernisthefaceoftheearth'sgreenhousegasesincreasingsoquicklyhasbeenathreattolifeonEarth.Humanactivitieshaveledtoglobalwarming,suchasdeforestation,whichmeansthatareductionofcarbondioxideintooxygen,andtheburningoffossilfuelsleadtosea-levelrise,Antarcticmeltingsnowand
5、icetemperature.Meansea-levelrisecanbeusedtoreducethelandarea,meltingtheicemeansthatthereleaseofanyhazardoussubstancesmayalsocausefurthersea-levelrise.Theincreaseintemperatureofbacteriaandviruseswillalsoprovideafavorablegrowthconditions,whichwouldleadtomorediseases.Furthermore,whereverwegotoday,w
6、ecanfindrubbishcarelesslydisposed.Pollutionis,infact,threateningourexistence.然而全球气候越来越暖的最主要原因就是人类的日常活动，人们在生产的过程中产生大量气体如二氧化碳和氮气等气体。如果大气中缺乏这种气体，地球会变得太冷从而破坏生物的生存。在大气中有一定的温室气体是很自然的事情，有一些人认为，证据表明即使没有人类的影响我们也将进入另一个冰河时代。但令人关注的是地球上的温室气体增加如此之快，已经严重威胁到了地球上的生物。人类活动导致全球变暖的问题,如森林砍伐,这意味着减少二氧化碳转化为氧气,燃烧化石燃料导致海平
7、面上升,南极大陆的融化的雪和冰的温度。意味着海平面上升可以用来减少将冰融化的土地面积,意味着释放任何有害物质,也可能导致进一步的海平面上升。温度升高的细菌和病毒还将提供一个良好的发育条件,从而导致更多的疾病。另外，无论我们走到哪里，到处可见随意丢弃的垃圾。事实上，污染正威胁我们的生存。Nowinsomeplacesofourcountry，anumberofpeoplehavebeencuttingdownthetreesintheforest
