ProtectionoftheEnvironmentOncemandidnothavetothinkabouttheprotectionofhisenvironment.Therewerefewpeopleontheearth,andnaturalresourcesseemedtobeunlimited.Todaythingsaredifferent.Theworldhasbecometoocrowded.Weareusingupournaturalresources,andpollutingourenvironmentwithdangerouschemicals.Ifwecontinuetodothis,humanlifeonearthwillnotsurvive.Werealizethatiftoomanyfisharetakenfromthesea,therewillsoonbenoneleft.Yet,withmodernfishingmethods,moreandmorefisharecaught.Weknowthatiftoomanytreesarecutdown,forestswilldisappear.Yet,wecontinuetousepowerfulmachinestocutdownmoreandmoretrees.Weseethatifriversarepollutedwithwasteproducts,wewilldie.Yet,wasteproductsarestillputintorivers.Weknowthatifthepopulationcontinuestoriseatthepresentrate,inafewyears,therewon＇tbeenoughfood.Whatcanwedotosolvetheseproblems?Ifweeatmorevegetablesandlessmeat,therewillbemorefoodavailable.Landforcropsfeedsfivetimesmorepeoplethanlandwhereanimalsarekept.Ournaturalresourceswilllastlongerifwelearntorecyciethem.Theworldpopulationwillnotrisesoquicklyifpeopleusemodernmethodsofbirthcontrol.Finally,ifweeducatepeopletothinkabouttheproblemsweshallhaveabetterandcleanerplanetinthefuture.保护环境过去,人们不必担心保护环境的问题.因为那时地球上人口稀少,自然资源似乎取之不尽.如今,一切都改变了.世界变得拥挤异常.我们正在耗尽我们的自然资源,有毒化学制品的使用也正污染着环境.如果我们继续这样下去,地球上的生命将不复存在.我们都知道如果从海里捕捉太多的鱼,海里就不会再有鱼了.但是,现代化的捕鱼技术使得捕鱼量越来越大.我们都知道如果砍伐太多的树木,森林就会消失.但是,我们仍旧使用强大的机械砍伐越来越多的树木.我们都知道如果河水被废弃物污染的话,我们只有死路一条.但是废弃物仍然源源不断地进入河里我们知道,人口继续照现在这个速度增长的话,不出几年,就会发生食物短缺.我们该如何解决这些问题呢?如果我们多吃蔬菜,少吃肉类的话,我们就会有更多的食物.因为同样大小的土地如果种庄稼的话会比养殖动物多养活五倍多的人.

　　世界各国的国庆节的由来.

　　NationalDayofthelonghistoryandgoesbacktoancienttimes.Therefore,thebasisfortherestoftheworldhaveestablishedtheNationalDaybizarre.Accordingtostatistics,countriesallovertheworldtoestablishthetimeofthecountry'sNationalDay35.ChinatothefoundingoftheNationalDayonOctober1,1949.OccupyingthecapitalofthedayastheNationalDayofCuba,Cambodia,theCzechRepublicandSlovakia.Someofthecountry'sIndependenceDayastheNationalDayofthecountry.January1,1804,theHaitianpeopleannihilatedtheNapoleonicexpeditiontothe60,000troopsinPort-au-Princetodeclareindependence,andthusputtotheannualNationalDayonJanuary1.Mexico,Ghanaandothercountriesaswell.Somecountriestothearmedintifadaanniversaryasanationalholiday.Romania,theCommunistPartyledanarmeduprisingtooverthrowthereactionaryruleofAntonescu,totheanti-fascistwaronAugust23,1944asNationalDay.FrancetodestroysymbolsoftheauthoritarianperiodforitsNationalDay.SomecountrieshaveagreatdayastheNationalDayofthemeeting.July4,1776theUnitedStatesadoptedthe"DeclarationofIndependence"mainlanddatefortheNationalDay.CanadaisJuly1,1867theBritishParliamentpassedthe"BritishNorthAmericaAct"thatdayastheNationalDay.JapanisthebirthdayofEmperorHirohitoofJapanfortheNationalDay.Thereistheheadofstate'sbirthdayanationalholiday,Nepal,Thailand,Sweden,theNetherlands,Denmark,Belgiumandothercountries.