MU the earth is becoming warmerPPT课件

1、earthquake第1页/共19页floods第2页/共19页droughts第3页/共19页第4页/共19页第5页/共19页Reading tips skim the title and Para 1: Title: THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?Para 1: how has this come about and does it matter?happen第6页/共19页Read and underline the topic sentences of each paragraph. So how has this co

2、me about and does it matter? that it is human activity that has caused this global warming rather than a random but natural phenomenon. All scientists subscribe to the view that the increase in the earths temperature is due to the burning of fossil fuels like. the levels of carbon dioxide have incre

3、ased greatly over the last 100 to 150 years. it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. the attitudes of scientists towards this rise are completely different. No one knows the effects of global warming. Does that mean we should do nothing?

4、agreeled to第7页/共19页 Reading tips: In English, some nouns begin with a capital letter(大写字母), such as names of people and places, titles(标题) of magazines, newspapers, stories and books, peoples titles(头衔), etc.global warming第8页/共19页Para.2 Human activity has caused global warming.Para.3 The increase of

5、 temperature is due to the burning of fossil fuels.Para.4 The levels of carbon dioxide have increased greatly.Para.5 The burning of more and more fossil fuels has resulted in the increase of carbon dioxide.=This increase in carbon dioxide has resulted from the burning of more and more fossil fuels.第

6、9页/共19页The attitudes of scientists to/towards the riseDr Foster George HamblyAttitudeReasonsThe trend which increase the temperature by 5 degrees would be a catastrophe.They are opposed to the view and believe that we should not worry about high levels of carbon dioxide in the air.There may be a ris

7、e of several meters in the sea level, or predict severe storms, floods droughts, famines, the spread of disease and the disappearance of species.It will make plants grow quicker; crops will produce more; It will encourage a greater range of animals- all of which will make life for human beings bette

8、r.第10页/共19页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 global warming.Choices: to do sth. or not第11页/共19页1.

9、 It is the burning of more and more fossil fuels like coal, natural gas and oil that is resulting in this increase in the earths temperature. 2. The earth is becoming warmer. 3. An increase of five degrees in the amount of warming would be a catastrophe .4. Any warming will be mild with few bad envi

10、ronmental consequences. 5. Greenhouse gases continue to build up in the atmosphere.Fact or Opinion?( O )( F )( O)( O )( F )第12页/共19页What is NOT true according to the passage?A.The rise in carbon dioxide is causing an increase in global warming.B. Everyone believes that global warming is caused by th

11、e activities of human.C. George Hambley believes that global warming will do good to the earth.D. It is clear what the effects of global warming will be.第13页/共19页DiscussionShould we do something or nothing about the global warming? Why?第14页/共19页Step V Summary The earth is becoming warming and all sc

12、ientists _ _ the view that the increase in the earths temperature is due to the burning of _. Some _ of this process are called _, the most important one of which is _. We need these gases, but the problem begins when we add huge _ extra carbon dioxide into the atmosphere. It means that more heat en

13、ergy _ to be trapped in the atmosphere causing the global temperature to _. A scientist called Charles Keeling found that the carbon dioxide in the atmosphere went up from around subscribe tofuelsgreenhouse gasesbyproductscarbon dioxidequantities oftendsgo upfossil第15页/共19页315 parts to around 370 pa

14、rts _ million in 40 years. All scientists accept the date and agree the burning of more and more fossil fuels has _ this increase. However, the attitude of scientists towards this rise is completely different. On the one hand, Dr. Foster thinks that the _ which increases the temperature by 5 degrees

15、 would be a _. On the other hand, George Hambley, who _ this view, believe that we should not worry about high levels of carbon dioxide in the air. They predict that any warming will be _ with few bad environmental _. But no one really knows the effects of global warming.perresulted in trendcatastropheare opposed tomildconsequences第16页/共19页Thank you! 第17页/共19页1.What is “greenhouse gases”?Some byproducts of this process are called “greenhouse” gases, the most