unit4 (3).ppt

1、What is happening to our earth?,Global warming,1.What causes temperature become worse? 2.If temperature rises by one degree, what will happen? 3.If temperature rises by two degrees ,what will happen? 4.If temperature rises by three degrees, what will happen?,?,The Earth Is Becoming Warmer But Does I

2、t Matter?,The Earth Is Becoming Warmer But Does It Matter?,Important words and expressions,All scientists subscribe to the view that the increase of the earth temperature is due to the burning of fossil fuels.,It is human activity that has caused this global warming rather than a random but natural

3、phenomenon.,More heat energy tends to be trapped in the atmosphere causing the temperature to go up.,Hambley is opposed to this view and believe that we shouldnt worry.,subscribe to : agree to,phenomenon: incident, fact (现象),go up : increase,be opposed to : against,The organization of the article:,I

4、ntroduction,A title,Body,Conclusion,the body part(7 paras):,Para. 1,Para. 2-5,I,II,Para. 6,III,Para. 7,IV,Introduction,Body,Conclusion,Match the main ideas of each part(连线),Part1 (1),D.Introduce a debate over global warming.,Part2 (2-5),C.The earth is becoming warmer and that it is human activity th

5、at has caused this global warming.,Part3 (6),B.List two different attitudes among scientists towards the consequences of global warming.,Part4 (7),A.Two choices of dealing with this problem.,Who wrote the article?,What is the name of the magazine?,Tip: In English, some nouns begin with a capital let

6、ter(大写字母), such as names of people and places, titles of magazines, newspapers, stories and books, peoples titles(头衔), etc.,Sophie Armstrong,Earth Care,Skim the first paragraph:,What has caused the global warming?,What are the two graphs about?,Graph 1 shows the temperature increase of one degree Fa

7、hrenheit between 1860 to 2000.,Graph 2 shows the carbon dioxide content in the atmosphere from 1957 to 1997.,Graph 1:,Graph 2:,Human activity: _,the _ in carbon dioxide,more _from the sun will be _,the increase in the earths temperature,the burning of fossil fuels,result in,How has this come about?,

8、increase,heat,trapped,Para. 3, 4 &5,coal, natural gas &oil,evidence from Charles Keeling,the greenhouse effect,1-1.5 degrees min. or 5 degrees max.,What attitudes among scientists towards global warming?,Dr. Janice Foster thinks the effects of global warming could be very serious. George Hambley thi

9、nks global warming will be mild with few bad environmental consequences.,They dont agree with each other.,Part III(Para6),Dr. Janice Foster & George Hambley,negative,positive,sea level rise,severe storms, floods, droughts, famines,spread of diseases,disappearance of species,catastrophe,positive,mild

10、,few,worry,serious,plants grow quicker,crops produce more,a greater range of animals,human life easier and better,Para. 7: Does it matter?,1. The writer probably thinks _. A. It matters. B. It doesnt matter. c.The writer didnt state his opinion. 2. What probably does the writer want us to do by the

11、last two questions?,We should conserve energy and protect the earth.,c,1.The temperature last century didnt increase much. 2.Everyone believes that global warming is caused by the activities of humans. 3.Janice Foster believes that global warming is caused by burning fossil fuels.,F,T,p1: it is a ra

12、pid increase compared to most natural changes,T or F Questions,T,4.Flooding could be one of the effects of future global warming. 5.George Hambley believes global warming will do good rather than harm to the earth. 6.George Hambley is worried about the effects of carbon dioxide on plant growth. 7.It

13、 is clear what the effects of global warming will be.,T,T,F,F,P10: positive,P11: No one knows,Fill in the blanks,From the passage we know that the (1)t_ of the earth,is on (2)r_ At the same time, this passage also shows us,peoples (3)d_ ideas about (4)_ warming, and analyses the reasons for global w

14、arming and the possible impact based on (5)g_ and data.,emperature,ise,ifferent,global,raphs,Discussing,could we, as an individual do something about global warming?,Group discussion: What can/should we do?,At home/work/school Clothing /food/ housing/ transportation Policies, laws, finance Media, transportation, design of buildings You may also refer to the pictures on Page 25.,turn electrical appliances off walk or ride a bike recycle cans, bottles, plastics plant trees buy products that are made to save energy educate others,Homework,Read the text a