高中英语-人教版选择性必修第三册-Unit-3课件.pptx--（课件中不含音视频）

1、12 To discuss climate change To learn to identify the style of this text and infer the writers purpose To learn to draw a diagram To think about how we can do to deal with climate change3Climate change is a heat topic for the scientists around the world.They all try to find out the truth about these

2、 questions:What causes the climate change?What are the solutions to stop climate change?View the video.45But someone may ask:is climate change really a problem?Why?It leads to floods/flooding.Its getting hot and hotter and so there are more droughts.The polar ice sheet is melting and the sea levels

3、are rising.Sea-level rise in turn causes damage to coastal regions.6 Lead to extreme weather which in turn impacts farming and harvests Disrupt the balance of the ecosystem Destruct wildlife Deforestation 7 What is the graph about?What information can you get from it?Have you ever seen the photo bef

4、ore?What might be the story behind it?Before you read,look at the graph and the picture on Page 26 and discuss these questions in groups.81.What type of writing is this passage?A.Argumentative writingB.Narrative writingC.Expository writingD.Advertising writingC2.In which part of a newspaper or magaz

5、ine may we find this passage?A.Entertainment B.EconomyC.Education D.EnvironmentDRead the passage quickly,and choose:9Read the text quickly,and figure out the main idea of each paragraph.Para.1The earth is getting warmer.Para.2A specific example of the results of climate changePara.3A major reason of

6、 global warming is“man-made”greenhouse effect.Para.4The danger of rising temperaturePara.5We should seize every opportunity to reduce global warming.10Read the text carefully,and answer the questions.1.What happened to the polar bear in the photo?Why did the writer write about it?Possible answers:Th

7、e polar bear died of starvation/hunger.The write used this alarming case as an example to show us how the increase in temperature had terrible impact on Earths ecology.11dead polar bear inNorways Arctic island of Svalbard122.Why is the“natural”greenhouse effect important and necessary?One possible a

8、nswer:Greenhouse gases can trap some of the heat,which can keep Earths climate warm and habitable.Without this process,Earth could not sustain life.131.What are the“greenhouse gases”?In the atmosphere surrounding the earth there are gases called“greenhouse gases”,including carbon dioxide,methane(甲烷甲

9、烷,沼沼气气).2.How do you understand“greenhouse effects”?They trap the heat from the sun,which causes the temperature of earth goes up.Related questions:143.What are the consequences of high greenhouse gas emissions?Possible answers:Earths surface temperature to rise extreme weather natural disasters low

10、 sea-ice levels causing deaths economic losses154.Why did the author mention the climate scientists warning?One possible answer:The topic is a scientific one,so adding the climate scientists warning can make the authors opinion(or writing)more persuasive form the scientific aspect.On the other hand,

11、we readers may feel more reliable about the authors attitude if it is based on the research of some scientists.165.What is the authors purpose of writing this text?One possible answer:The author hopes we can pay attention to the climate change and do something to stop it.For he or she writes“We as i

12、ndividuals can also reduce our carbon footprint”and“It is our responsibility to seize every opportunity to educate everyone about global warming.”17The _ is getting warmer and warmer.Evidence one:_Evidence two:_Evidence three:_a warming ocean and atmosphere Read paragraph one,and fill in the blanks.

13、Earthmelting icerising sea levels18Time Where What happenedHow did it happen2013Norways Arctic island of SvalbardA polar bear died of starvation.Paragraph 2 introduces an example of the increase in temperature that had an impact on Earths ecology.Read it and fill in the blanks.The bear cannot hunt f

14、ood because of low sea-ice levels.19Trap heat from the sun to keep the Earths sustainable life.Read Paragraph 3,and figure out the reason why earths temperature rising.Green-house effect“Natural”greenhouse effect“man-made”greenhouse effectBy burning fossil fuels,extra greenhouse gases cause Earths t

15、emperature to rise.20Read the article again and create a diagram describing how the greenhouse effect works.图表；图解图表；图解21Draw a diagramDiagrams are very useful tools that can be used to brainstorm ideas,map out processes,show cause and effect relationships,explain a new idea or concept and so on.When

16、 you read an essay about scientific issues,you can try drawing a diagram,which will not only allow you visualise the problems more clearly but also can help demonstrate your creative thinking and problem-solving.22Summarize the main idea of paragraph 4,according to the diagram.Temperature risingExtr

17、eme weather&natural disasterSerious damage&human livesWe should take appropriate actions at once.23In Paragraph 5,the author hopes everyone can take actions to reduce our“carbon footprint”.As individuals,what can we do in our daily life to help to minimize climate change?24 Use renewable energies Sa

18、ve energy Stop using plastic bags Live a low-carbon life Use the minimum paper,backing paper etc.Take green transportation Take a shower instead of a bath Turn off the lights,computers etc.the moment you dont need them 25Discuss the questions in groups.1.What examples of extreme weather and disaster

19、s do you know?Can you make a list?2.Do you think climate change is the result of human activity?Give your reasons.3.Who do you think should take responsibility for dealing with climate change?What can we do?26Words you may use:Adjs:inhospitable,sever,mild,hot,tropical,reusable,recycled,economicVerbs

20、:mitigate/reduce/alleviate/minimise climate change;deal with/tackle/solve/stop/prevent climate changeNouns:Gas emissions,carbon dioxide,CO2,fossil fuels,extreme weather,natural disasters,rainstorms,heatwavesadj.不适宜居住的不适宜居住的27Global warming1.The planet has warmed anywhere from 0.5 to 1.0(1 to 2 )over

21、 the last century.2.A definition of global warming would have to include a measurable,consistent temperature rise,like the one we have seen in recent history.A question remains Is it an unusual change?Much debate about that one.283.The earth gets one kind of energy(visible light)from the sun and giv

22、es off another kind(infrared红外线红外线).This kind is what gets trapped by“greenhouse gases”(GHGs)in the atmosphere.29Greenhouse gases4.A greenhouse keeps warm by physically trapping the air inside and preventing convection(对流对流).The atmosphere helps keep the planet warm by trapping outgoing radiation in

23、stead.305.The leading gasses are Carbon-dioxide,Methane,Ozone(臭氧臭氧)and Nitrous Oxide(一氧化二氮一氧化二氮).Gas analyzers show the concentrations of this stuff have increased somewhat since the beginning of the industrial revolution.316.The greenhouse effect raises the average temperature of the Earth by more than 30 degrees,so without it the Earth would be a very cold place!321.Retell the reading passage in your own words.2.Preview page 28 and finish the exercises 1&2.3334