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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 2 Saving the EarthTopic 2 All these problems are very serious.,Section C,Unit 2 Saving the EarthTopic,Discuss:,All of the humans have a home.Its the _.,Are all the things that we have done good for our,planet,?,What have humans done to destroy our home?,earth,Discuss:earth,oxygen,ksdn,a special kind of oxygen,called“ozone”(O3),氧气,臭氧,zn,oxygenksdn a special,ozone layer,臭氧层,牍壤筢蕃丹滁耸关佾疑曜彀幕劈圳卢骥觉廒蜮存敌浜垧颞卵芜然奕感簧蠢漱谇炒嘶鲠饱娌凛绽旎佘,zn le(r),1.Its like an umbrella of the earth and protects the earth.,2.But What happens to,the ozone layer,(the,umbrella,),?,There re some,holes,.,Good or bad?,ozone layer 臭氧层牍壤筢蕃丹滁耸关佾疑曜彀幕,Too much harmful radiation from the sun passes _ the hole and reaches the _ directly.,through,earth,Too much harmful radiation fro,carbon dioxide(CO2),牍壤筢蕃丹滁耸关佾疑曜彀幕劈圳卢骥觉廒蜮存敌浜垧颞卵芜然奕感簧蠢漱谇炒嘶鲠饱娌凛绽旎佘,k(r)bn da:ksad,二氧化碳,1.Carbon dioxide mainly comes from _,_ and _.,burning oil,coal,wood,carbon dioxide(CO2)牍壤筢蕃丹滁耸关佾,2.The heat from the sun cant,escape,（,渗出）,so the temperature is _.This is called“_.”,rising,the greenhouse effect,More carbon dioxide,around the earth,2.The heat from the sun cant,New words,take away,拿走,oxygen ksdn,n.,氧气,hole hl,n.,洞，坑,ozone layer zn le(r),臭氧层,radiation.redie()n,n.,放射，放射物,directly drek(t)li,adv.,直接地,carbond dioxide,k(r)bn da:ksad,n,.,二氧化碳,form f:rm,v.(,使）出现；（使）形成,n.,种类，形式,blanket blkt,n.,毛毯，毯子,escape skep,v.,逃脱，渗出，逃跑,rise raz,v.,上升，起床，升起,The green house effect,温室效应,referrf:(r)to,v.,提到，涉及，有关,New wordstake away 拿走,fewer trees,factory pollution,traffic pollution,the ozone layer,more carbon dioxide,Can you match them?,1a Read and understand.,fewer treesfactory pollutiontr,P40 1.Choose suitable tittles for Paragraphs 2-6.Then write it down in front of each paragraph.,The earth is,4.6 billion,years old.We humans have lived on,the,earth for only 35 000 years,but during this period,we have changed,our planet,a lot in many ways.Some things weve done are very good for the earth while some are bad.,_,All over the world,people have cut down millions of trees.When it rains or when the wind blows,the earth is taken away.Forests have,become deserts,so m,any,kinds,of animals and plants are disappearing.,Fewer Trees,A.Traffic pollution B.Factory pollution C.Fewer trees D.The ozone hole E.More carbon dioxide,P40 1.Choose suitable tittles,_,In big cities,cars and buses have polluted the air.,Now m,any people in cities have health problems.,_,Factories have also polluted the land and the water.As a result,many rivers and lakes are now dead.,_,Around the earth,theres a special kind of oxygen called“ozone”(O,3,).It is important to the earth.But now air pollution is destroying,it,and,making,a very big hole in the ozone layer.Too much harmful radiation from the sun passes through the hole and reaches the earth,directly.,This is very dangerous because this kind of radiation can cause cancer.,Traffic Pollution,Factory Pollution,The Ozone hole,直接地,_ In big cities,c,_,Carbon dioxide(CO,2,)in the air has increased a lot.It mainly comes from burning oil,coal and wood.This has formed a,blanket,around the earth.The heat from the sun cant escape so the temperature is rising.This is called“the greenhouse effect”.It causes the level of the oceans to rise and the climate of the earth to change.,All these problems are very serious,so we must do something now.,More Carbon Dioxide,_ Carbon dioxi,1.The age of the earth:_,2.How long have humans lived on earth?,_,3.Why are more and more sorts of animals and plants disappearing?,_,4._ and _ have polluted the air in big cities.,5.Many rivers and lakes are _ because factories have polluted the land and the water.,4.6 billion years old,For only 35 000 years.,Because forests have become deserts.,Cars,buses,dead,Read 1a again and finish.,1.The age of the earth:_,Write down only the key words when taking notes.,1c Complete the notes according to 1a.,Write down only the key words,Problem,Effect on the environment,fewer trees,forests become deserts,animals and plants disappear,traffic pollution,greenhouse effect,level of oceans rising,climate change,cars and buses pollute air,health problems,pollute land and water,rivers and lakes dead,harmful radiation reaches the earth,cause cancer,factory pollution,ozone
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