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1、Unit 4,Global warming,energy sources,We depend on energy to do many 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 you
2、r home,micro-wave oven,cassette player,heating,television,hairdryer,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
3、 Refineries,a facility designed to convert nuclear energy into electricity.,A nuclear 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,are used to keep back water and raise its level for irrigation or
4、 for producing electricity,etc.,The Hydro-electric dams,Guess it!,Uranium Ore(铀矿石)The element uranium does not occur in pure form in nature but is found in minerals such as carnotite（钒钾铀矿）,pictured here.,What source of energy?,Geysers(间歇泉),Geothermal(地热的)Energy Plant,An energy source is“renewable”wh
5、en 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,light,heating,television,cassette player,video player,computer,fridge,stove,washing machine,hairdryer,coal,oil,natural gas,wind(wind p
6、ower),sun(solar energy),uranium(nuclear energy),water(hydro-electric power),plant waste(biomass energy),hot spring or geysers(geothermal energy),the sea(tidal energy),non-renewable,non-renewable,non-renewable,renewable,renewable,non-renewable,renewable,renewable,renewable,renewable,What are these bu
7、ildings made of and what is their purpose?,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,making the air warm so that plants can grow better.,Greenhouse gases!,Whats greenhouse gases effect?,Greenhouse gases perform t
8、he 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 Becoming Warmer But Does It Matter?,Fast Reading,Glance at the article and answer the question.,It has a title,a first paragraph th
9、at runs across the page and is in bold,the main text in two columns,graphs/diagrams,two quotes.,What is the structure of a magazine like this and how is the text organized?,Reading comprehension,Read the article again and finish comprehending on page 27,Sophie Armstrong wrote the magazine article.Th
10、e 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 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
11、one another?,There are some very different attitudes among scientists towards this issue.Some think the effects will be terrible,while some others believe 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
12、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?,Global warming/The warming of the earth.,1.The temperature last century didnt increase much.2.Everyone believes that global warming is caused by the activ
13、ities of humans.3.Janice Foster believes that global warming is caused by burning fossil fuels.4.Natural gas is a greenhouse gas.5.Carbon dioxide is a byproduct of burning fossil fuels.6.People accept Charles Keelings data because he took accurate measurements.,Read the article carefully.Tell true o
14、r false.,T,T,F,T,T,F,Detailed-Reading,Read the article in details and finish the following task.,listening,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.,Listen to the reading passage and do s
15、ome choices.,2.But there are some very different attitudes among scientists towards this issue.”“issue here means the same as the one in_.A.I bought the new stamp 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 stat
16、ement about the election.D.The magazine has 12 issues each year.,3.The author probably agrees that _A.actually 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
17、global warming.,Questionnaires-I,1.Does Sophie Armstrong support a clear opinion?2.Does George Hambley believe that we should worry much about the global warming?,No.he doesnt state it clearly.,No,he doesnt.,3.How has the global warming come about?,Human activity-burning of fossil fuels.,Greenhouse
18、effect-greenhouse gases-we need those gases.,Huge quantities of extra carbon dioxide-from 1957 to 1997-from around 315 parts per million to around 370 parts per million.,4.What are the effects of global warming?,Encourage a greater range of animals.,The sea level to rise.,Severe storms,droughts,fami
19、nes,the spread of diseases,and destruction of species.,Make plants grow faster.Crops will produce more.,main idea,Part1(para1),Introduce a debate over the issue of global warming,Part 2(para2),Part 3(para3-8),Part 4(para9),Illustrate how global warming comes about,List two different attitudes among
20、scientists towards global warming,Its up to readers to think and decide whether people should do sth about global warming or not,4 parts,1.What is the purpose of the paragraph that is in bold?,To introduce the topic.,To illustrate(阐述)points by providing evidence.,2.What are the diagrams for?,Questio
21、nnaires-II,3.Why are there two quotes?,Because they are important or interesting points.Their aim is to attract your attention and to make you read them,and therefore to make you interested enough to read the whole article.,It functions as a conclusion by asking the reader to reflect on the major theme of the text and to predict what might happen in the future.,4.What is the purpose of the last paragraph of the article?,The different ideas between Dr.Janice Foster&George Hambley,go up,catastrophe,very serious,positive,produce,a greater range of animals,
