选修Unit公开课正式ppt课件.ppt

这幅图片传达的意思是地球正在持续升温 可怜的最耐寒的北极熊 都脱去了他衣服 北极常年冰冻 十分寒冷 北极熊都受到了如此厉害的影响 可见全球变暖是多么的厉害 关爱环境 是迫在眉睫需要注意的事情 1 全球变暖是给我们埋下的定时炸弹 不定什么时候 就会爆炸 为了我们自身 我们也应该保护环境 保护地球 2 冰做的人代表人类 冰遇热会融化 全球变暖 冰人正在一点点融化 直至最后消失 这也预示着全球变暖是人类灾难的开始 为了我们能够更好的生存 我们应该用实际行动阻止全球变暖 3 二氧化碳的增多 是全球变暖的原因之一 树木能够将二氧化碳吸收转换成我们呼吸所需要的氧气 多种树木 是最微小的阻止全球变暖的举动 而很多地方还存在着乱砍乱伐现象 缺少的树木就像我们的肺发生了病变 呼吸不畅 阻止全球变暖 拒绝乱砍乱伐 4 globalwarming 5 Whatarethey Whatarethesebuildingsmadeof What stheuse greenhouse glass Agreenhouseisusedfor especiallyduring weather Pre reading TurntoPre reading1 Page25 Read answer growingplants cold 6 theheatfromthesun keepsitfrom theairup Howdoesagreenhousework traps escaping heats 7 imaginethattheearthisagreenhouse theatmosphere 大气层 istheglass thenwhereistheheatfrom andonlyfromthesun 8 Dowehaveanyeffectontheearth swarming 9 Thingsthatconsumeenergy videoplayer refrigerator computer hairdryer light TV waterdispenser car washingmachine 10 energysources solarenergy oil coal biomassenergy nuclearenergy hydro electricpower windpower naturalgas wave tidalenergy 11 FossilFuel 矿物燃料 coal oil gas produce 12 Whatdoyouthinkgreenhousegasesdo Greenhousegasestraptheheatofthesunandthereforewarmtheearth Itisknownas Nowadaysourearthisbecoming greenhouseeffect warmerandwarmer 13 Page26 Theearthisbecomingwarmerandwarmer butdoesitmatter 14 FastReading Glanceatthearticleandanswerthesequestions 15 SophieArmstrongwrotethemagazinearticle Thenameofthemagazineis Earthcare 2 Whatarethenamesofthethreescientistsmentionedinthearticle TheyareDr JaniceFoster CharlesKeelingandGeorgeHambley 1 Whowrotethemagazinearticle Whatisthenameofthemagazine 16 3 Whatarethetwographsabout Graph1showsthetemperatureincreaseofonedegreeFahrenheitbetween1860to2000 Graph2showsthecarbondioxidecontentintheatmospherefrom1957to1997 Graph1 Graph2 17 4 Whatisthemaintopicofthearticle Globalwarming Thewarmingoftheearth 18 Detailed Reading Readthearticleindetailsandfinishthefollowingtask 19 1 During20thcentury thetemperatureoftheearthrose 2 SophieArmstrongwillexplore Para 1 aboutonedegreeFarenhait howhasthiscomeaboutanddoesitmatter 20 Para 2 1 Thereisnodoubtthatitis thathascausedtheglobalwarming humanactivity 21 Para 3 1 Allscientistsagreetheviewthattheincreaseintheearth stemperatureisdueto 2 Whenweaddhugequantitiesofextracarbondioxideintoatmosphere theproblembegins whichmeans theburingoffossilfuels theglobaltemperaturetogoup 22 1 WhatdidthescientistCharlesKeelingfindbetweentheyearsfrom1957to1997 Hefoundthatthecarbondioxidewentupfromaround315partstoaround370partspermillion Para 4 23 Para 5 1 Allscientistsacceptthedataandagreethatitisthathadresultedinthisincreaseincarbondioxide 2 DrJaniceFostersaysthattheamountofwarmingcouldbe butitcouldbe theburningofmoreandmorefossilfuels aslowas1to1 5degreeCelsius ashighas5degreeCelsius 24 Dr JaniceFosterthinkstheeffectsofglobalwarmingcouldbevery GeorgeHambleythinksglobalwarmingwillbe withfewbadenvironmentalconsequences They witheachother Para6 serious mild don tagree 25 causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspecies Positiveeffects Negativeeffects 26 causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspecies Positiveeffects Negativeeffects makeplantsgrowquickercropswillproducemoreagreaterrangeofanimalsmakelifebetter 27 Para 7 1 Evenifwestart theamountofcarbondioxideandothergreenhousegases theclimateisgoingtokeepon for10or100years 2 knowstheeffectsofglobalwarming reducing warming Noone 28 Let sdoourparttoprotectit 29 tomaketheearthabetterplacetoliveon 30 Homework Writeashortpassageabouttheeffec