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1、Unit 4,-warming up and reading,Global warming,Extreme heat 酷暑,Can you think of some natural disasters (自然灾害) because of the extreme heat?,drought(旱灾),fire,flood,hurricane /typhoon,I feel hot !,.,Low-carbon life （低碳生活）,Is the whole world becoming warmer and warmer? Why?,population,air pollution,carbo
2、n dioxide,acid rain,species extinction,water pollution,全球气候变暖是一种“自然现象”。人们焚烧化石矿物以生成能量或砍伐森林并将其焚烧时会产生二氧化碳等多种温室气体。这些温室气体对来自太阳辐射的可见光具有高度的透过性，而对地球反射出来的长波辐射具有高度的吸收性，能强烈吸收地面辐射中的红外线，导致全球气候变暖，也就是常说的“温室效应”。全球变暖会使全球降水量重新分配、冰川和冻土消融、海平面上升等，既危害自然生态系统的平衡，更威胁人类的食物供应和居住环境。,energy sources,We depend on energy to do man
3、y things in our daily lives. For example, energy lights our cities and heats our buildings. Make a list of things that use energy in your home, in your school, or any other places you can think of.,stove,light,things that use energy in your home,micro-wave oven,cassette player,heating,television,hai
4、rdryer,video player,fridge,computer,washing machine,stove,Wind energy is used as power to produce electricity .,Windmills,where electricity is produced by burning coals.,The coal power stations,in which oil is refined and made pure.,The Oil Refineries,to change nuclear energy into electricity.,A nuc
5、lear power plant,on the roof of a house on a bright sunny day are used to collect solar energy, making your house warm or heating your water.,Solar panels,The Hydro-electric dams,are used to keep back water and raise its level for irrigation or for producing electricity, etc.,An energy source is “re
6、newable” when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable?,Discuss,coal,oil,natural gas,wind (wind power),sun (solar energy),nuclear energy,water (hydro-electric power),the sea (tidal ene
7、rgy),non-renewable,non-renewable,non-renewable,renewable,renewable,non-renewable,renewable,renewable,Pre-reading,What is the greenhouse made and used for?,greenhouse,They are made of glass and plants can grow in it when it is cold outside.,How does it work?,The glass traps the heat from the sun, mak
8、ing the air warm so that plants can grow better.,Greenhouse gases!,Whats greenhouse gases effect?,Greenhouse gases perform the same function as the glass in a greenhouse - They trap the heat of the sun and keep the air surrounding the earth warm. It is called the greenhouse effect.,The Earth Is Beco
9、ming Warmer But Does It Matter?,Fast Reading,Glance at the article and answer these questions.,Sophie Armstrong wrote the magazine article. The name of the magazine is “Earth care”.,2.What are the names of the three scientists mentioned in the article?,They are Dr. Janice Foster, Charles Keeling and
10、 George Hambley.,1.Who wrote the magazine article? What is the name of the magazine?,3.What do they think about global warming? Do they agree with one another?,There are some very different attitudes among scientists towards this issue. Some think the effects will be terrible, while some others beli
11、eve that we should not worry about it.,4.What are the two graphs about?,Graph 1 shows the temperature increase of one degree Fahrenheit between 1860 to 2000.,Graph 2 shows the carbon dioxide content in the atmosphere from 1957 to 1997.,Graph 1:,Graph 2:,5.What is the main topic of the article?,Globa
12、l warming / The warming of the earth.,1.The temperature in the last century didnt increase much. 2.Everyone believes that global warming is caused by the activities of humans. 3.Janice Foster believes that she can measure the future global rise in temperature. 4.The rise in carbon dioxide is causing
13、 a steady increase in global warming. 5.George Hambley believes that global warming will do good rather than harm to earth. 6.It is clear what the effects of global warming will be.,Read the article carefully. Tell true or false.,T,T,F,T,T,F,Detailed-Reading,Read the article in details and finish th
14、e following task.,1. Who found out the amount of carbon dioxide in the atmosphere from 1957 to 1977? A. Dr. Janice Foster. B. Charles Keeling. C. George Hambley. D. Sophie Armstrong.,2. “But there are some very different attitudes among scientists towards this issue.” “issue“ here means the same as
15、the one in_ . A. I bought the new stamp on the day of its issue. B. They are talking about one of the key issues in the election campaign. C. The government is expected to issue a statement about the election. D. The magazine has 12 issues each year.,3. The author probably agrees that _ A. actually
16、global warming is good for man. B. we should do nothing about the global warming. C. catastrophes will happen if the globe keeps on warming. D. a lot remains to be found out about the effects of global warming.,4. How has the global warming come about?,Human activity- burning of fossil fuels., Greenhouse effect- greenhouse gases- we need those gases., Huge quantities of extra carbon dioxide-from 1957 to 1997-from around 315 p
