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4、大学生演讲稿 出国留学网英语演讲稿栏目为您提供《2014中学英语竞赛演讲稿》最新范文，仅供大家参考!更多内容欢迎访问www.liuxue86.com whatisnature?itseverythingthatexistsintheworldindependentlyofpeople,suchaspantsandanimals,earthandrocks,andtheweather. nowmoreandmorepeoplearefocusingont
5、henature.itisnodoubtthatthenatureisimportanttoeveryhumanbeing.nonature,nolife.becauseofthesuppliesofthenature,wehavelivedhappilyforalongtime.andwestartedtogaineverythingavailablefromthenature.andthislastedsolongatime.today,peoplehavediscoveredthatthenaturearoundisgettingworseandwor
6、se. whatisthreateningthenature?airandwaterpollution,overharvestingofplantandanimalspecies,overpopulationandsoon.overpopulationisthebiggestsourceofpollution.letstakeoverpopulationasanexample. whatdoesoverpopulationfeellike?whenwemoveslowlythroughthecityinatazi.whenweenteracrowdeds
7、lumdistrict.whenthetemperatureishighandwhentheairisthick.页脚.页眉.withdustandsmoke.thestreetsarecrowdedwithpeople.thestreetsseemalivewithpeople.peopleeating.peoplewashing.peopletalking.peoplesleeping.peoplevisitingeachother,arguingandscreaming.peoplerelievingthemselves.peoplepushingth
8、eirhandsthroughthetaxiwindows,begging.peopleleadinganimals.people,people,people,people.aswedriveslowlythroughthecrowd,soundingthetaxishorn,thedust,heat,noiseandcookingfiresmadeitlikeascenefromhell!iadmit,frightening.tothenature,overpopulationisabigproblem.morepeople,morepollution.a
9、ndthebigpopulationisthreateningthenatureeverysecond. therapidriseinworldpopulationisnotcreatingproblemsonlyforthedevelopingcountries.thewholeworldfacestheproblemthatrawmaterialsarebeingusedupatanincreasingrateandfoodproductioncannotkeepupwiththepopulationincrease.peopleinrichcount
10、riesmaketheheaviestdemandsontheworldsresources,itsfood,fuelandland,andcausethemostpollution.ababybornintheunitedstateswilluseinhislifetime30timesmoreoftheworldsresourcesthanababyborninindia.unlessallthecountriesoftheworldtakeunitedactiontodealwiththepopulationexplosiontherewillbemo
11、reandmorepeoplefightingfor
