欢迎来到天天文库
浏览记录
ID:45836873
大小:5.22 MB
页数:74页
时间:2019-11-18
《2019-2020年高中英语 Unit 20 New Frontiers教案 北师大版选修7》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、2019-2020年高中英语Unit20NewFrontiers教案北师大版选修7【美文阅读】 Ourworldin2050尽管人类在改造大自然方面已取得了不少成绩,但是人类频繁的活动已使今日的地球失去了原有的艳丽姿色。Whenscientistsscantheglobalhorizon,over-fishing,lossofspecieshabitat,watershortage,climatechange,andinvasive(侵害的)specieslooktobethebiggestthreats
2、totheearth.Whatwillourworldbelikein2050?PopulationdecreaseandincreaseTherearetwofeaturesinthegrowthofworldpopulation.First,theannualincreaseinpopulationin15Europeancountries,inthepastfewyears,hasbeenonly300,000.TheUnitedNationsestimatesthatby2050,thepopul
3、ationofEuropeancountrieswilldecreasefromthecurrent0.72billionto0.63billion.Second,thepopulationindevelopingcountriesisgrowingrapidly.Overthepast50years,therateofincreaseinpopulationhasbeenfastestintheleastdevelopedcountries.By2050,thepopulationofAfricaise
4、xpectedtoreach1.8billion,0.9billionmorethanitscurrentpopulation.GlobalwarmingArecentresearchreportindicatesthatitisquitepossiblethattheEarth'stemperatureisrisingwellabovethepreviousestimate.Sucharesultwouldhavesevereconsequences(后果).AresearchteamfromtheUn
5、iversityofColoradousedsatellitedatatoestimatethattheicesheetwillloseupto48cubicmilesby2050.IceshelvesintheAntarcticwillhavedecreasedbymorethan7,200squaremilesinthenextfourdecades.WatershortageAfrica'sriversfacedramatic(戏剧性的)changethatwillleaveaquarterofth
6、econtinentseverelyshortofwaterbythemiddleofthecentury.“Inthoseareaswherethereisalreadyawatershortage,it'sgoingtohaveadevastating(毁灭性的)effect,”thestudysays.“Ifyou'renowwalking5kmtotheneareststreamtogetwater,by2050,it'sgoingtomeanwalking30kmormovingyourwhol
7、ehouseholdclosertothewatersource.”Fourwheelsgood,fourwheelsbadThecarhastransformedthelivesofpeople,buttheplanetispayingtoohighaprice.Todaythereare620millionprivatecarsworldwide,tosaynothingofbuses,vansandlorries.Withcurrentgrowthtrends,thatnumberisexpecte
8、dtoreachastaggering(难以置信的)threebillioncarsworldwideby2050.Ifwecontinuetoburnfossilfuelsatcurrentrates,levelsofcarbondioxideintheatmospherewillreach550ppm(partspermillion)byaround2050.Thiswillincreaseglobaltemperatur
此文档下载收益归作者所有