(完整版)人教版英语选修六Unit4GlobalWarming(Reading课件.ppt

1、Global WarmingReading 4 4Pre-reading Have you ever seen a greenhouse?A greenhouseHow does it work?Question:What if more and more greenhouse gases surround the earth?温室效应使温室效应使50亿吨冰脱离南极亿吨冰脱离南极The Earth Is Becoming The Earth Is Becoming WarmerBut Does It WarmerBut Does It Matter?Matter?1.Who wrote the

2、 magazine article?Whats the name of the magazine?Read the magazine article quickly and think of Read the magazine article quickly and think of the following questions:the following questions:Fast Reading2.What are the names of the three scientists mentioned in the article?3.What is the main topic of

3、 the article?Sophie Armstrong.Earth Care.1.Who wrote the magazine article?Whats the name of the magazine?Dr.Janice Foster2.What are the names of the three scientists mentioned in the article?Charles KeelingGeorge Hambley3.What is the main topic of the article?Global warming/the warming of the earth.

4、1.During the 20th century the temperature of the earth rose about 2 degrees Fahrenheit.2.There is no doubt that the earth is becoming warmer.3.All scientists believe that the increase in the earths temperature is due to the burning of fossil fuels.I.Listen to the tape.Are these statements True(T)or

5、False(F)?4.Greenhouse gases continue to build up in the atmosphere.5.George Hambley believes that global warming will do good rather than harm to the earth.II.The different ideas between Dr.Janice Foster&George Hambley Dr.Janice FosterGeorge HambleyCarbon dioxide has caused the global temperature to

6、 _.An increase of five degrees would be a _ and could be _.More carbon dioxide is a _ thing,which will make crops _ and will encourage _ animals.go upcatastrophevery seriouspositiveproduce morea greater range ofCareful ReadingOf the two ideas,which are you in favor of?Dr Janice Fosters.Why?Because w

7、e have witnessed(见证见证)a large number of disasters predicted by some people.Pair workWhats worse,the glaciers(冰川冰川)of the South Pole are beginning to crack(破裂破裂).The glaciers of the Poles are starting to melt due to the increasing temperatures caused by global warming.Tsunami(海啸海啸)The sea level to ri

8、se.Tornados(飓风)Severe stormsdroughtsfaminesthe spread of diseasesdestruction of speciesDiscussionWhat can we do to control the greenhouse effect(温温室效应室效应)?.Try to reduce the use of motor vehicleselectric vehiclebikerunningSolar energy carPlanting treesCleaning the Cleaning the rubbishrubbishReturn t

9、he green world to usSummary:Summary:What do you learn What do you learn from the text?from the text?Lets save energy and protect theenvironment together.Preview the language points in the text and find out your difficult points.Effects of Global WarmingScientists say the warming of the Earths atmosp

10、here has begun to affect plant and animal life around the world.Scientists from the University of Hanover in Germany reported their findings in the publication Nature.They say global warming is affecting endangered species,sea life and the change in seasonal activities of organisms.Global warming is

11、 caused by carbon dioxide and other heat-trapping gases in the atmosphere.Studies show that the Earths climate has warmed by about six-tenths of one degree Celsius duringthe past one-hundred years.Most of the increase has taken place in the last thirty years.The German scientists studied different a

12、nimal and plant populations around the world in the past thirty years.They say some species will disappear because they can not move to new areas when their home climate gets too warm.The scientists say one of the biggest signs of climate change has been the worldwide reduction in coral reefs.Rising

13、 temperatures in the worlds warm ocean waters have caused coral to lose color and die.In the coldest areas of the world,winter freezing periods are now happening later and ending earlier.Researchers say these changes are having severe effects on animals such as penguins,seals and polar bears.Changes

14、 in temperature and wetness in the air can also affect the reproduction of some reptiles and amphibians.For example,the sex of baby painted turtles is linked to the average temperature in July.Scientists say even small temperature increases can threaten the production of male turtles.In Europe,scien

15、tists say warmer temperatures are affecting the spring and autumn seasons.This is affecting the growth of plants and delaying the flight of birds from one place to another.Scientists are concerned about invasions of warm weather species into traditionally colder areas.Rising temperatures have been l

16、inked with diseases spread by mosquito insects in areas of Asia,East Africa and Latin America.Britains Meteorological Office says worldwide temperatures will continue to rise during the next one-hundred years.It says how much temperatures increase will depend on the success of worldwide policies des

17、igned to slow global warming.The end of this period!Read the text carefully and choose the best answers.Which of the following is TRUE according to the text?A.The temperature of the earth increased about one degree Fahrenheit during the 20th century.B.The carbon dioxide content in the air increased

18、by 70 parts per million from 1957 to 1997.C.All scientists accept the data in graph 2 except Charles Keeling.D.Janice Foster says that more carbon dioxide will make plants grow faster.1.What is the purpose of the first paragraph?2.What are the diagrams for?To introduce the topic.To illustrate points

19、 by providing evidence.3.Why are there two quotes?4.What is the purpose of the last paragraph of the article?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 func

20、tions 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.5.How has global warming come about?Human activityburning of fossil fuelsGreenhouse effectgreenhouse gases we need those gases from around 315 parts per million to around 370 parts per millionHuge quantities of extra carbon dioxideFrom 1957 to 1997