高中英语选修六unit4-reading-pp课件.ppt

1、Unit 4 Global WarmingUnit 4 Global Warming Reading1ppt课件 lead in Can you think of some natural disasters(自然灾害自然灾害)because of the extreme heat(酷酷暑暑)?2ppt课件drought(旱灾旱灾)3ppt课件4ppt课件The Earth is Becoming Warmer-But Does It Matter?地球在变暖地球在变暖要不要紧？要不要紧？Reading5ppt课件 Words and expressionstemperature 温度 one

2、 degree Fahrenheit 华氏一度explore 探索human activities 人类活动phenomenon 现象 subscribe to 同意，赞成 fossil fuels 矿物燃料byproduct 副产品“greenhouse”gases 温室气体atmosphere 大气methane 甲烷，沼气degree Celsius 摄氏度quantities of 大量的accurate measurements 精确的测量data 资料，数据catastrophe 大灾难be opposed to 反对environmental consequences 环境影响a

3、 great range of 大量的 even if 即使 keep on 继续6ppt课件 Scanning Who：_Three scientists:_ _ Sophie ArmstrongDr Janice Foster;Charles Keeling;George Hambley;7ppt课件What are the two graphs about?Graph 1 shows the temperature difference(温度差温度差异异)from 1860 to 2000.Graph 2 shows the carbon dioxide content(二二氧化碳含量氧

4、化碳含量)in the atmosphere from 1957 to 1997.Graph 1:Graph 2:8ppt课件9ppt课件Paragraph 1Paragraphs 2&5Paragraph 6Part1Part2Part4Main idea of the textPart3Paragraph 7How global warming comes about?(全球变暖是怎样产生的全球变暖是怎样产生的)Two different opinions about global warming.The earth is becoming warmer.Should we do anyt

5、hing?10ppt课件1.During the 20th century,the temperature of the earth didnt seem to increase much.2.There is no doubt that global warming is caused by the human activities.3.Not all scientists believe that the increase in the earths temperature is due to the burning of fossil fuels.True or false 11ppt课

6、件4.The levels of carbon dioxide have increased greatly over the last 100150 years.5.George Hambley believes that global warming will do good to the earth.6.We know the effects of global warming.12ppt课件How has global warming come about(产生产生)?1.Human activity The problem begins when huge quantities of

7、 extra carbon dioxide(大量的二氧化碳)are added into the atmosphere.is due to the burning of fossil fuels2.Greenhouse gasesParagraph 2&313ppt课件carbon dioxideFossil Fuel(矿物燃料)coaloil gasglobal warming produce二氧化碳二氧化碳14ppt课件Have you ever seen a greenhouse?15ppt课件Methanemi:ein What are Greenhouse gases?There a

8、re gases called“greenhouse gases”,includingCarbon dioxideWater vapourThey trap the heat from the sun and warm the earth.16ppt课件Para 4.the levels of carbon dioxide have increased greatly over the last 100 to 150 years1.Who made accurate measurements of the amount of carbon dioxide?2.How much has incr

9、eased?Charles KeelingThe carbon dioxide in the atmosphere went up from around 315 parts to around 370 parts per million.17ppt课件Para 5.How high will the temperature go?The amount of warming could be as low as 1 to 1.5 degrees Celsius,but it could be as high as 5 degrees.18ppt课件Dr.Foster:_George Hambl

10、ey:_ What do the scientists think about global warming?Do they agree with one another?It would be a catastrophe.we should not worry about it.They have quite different attitudes towards this issue.Paragraph 619ppt课件Does global warming matter?Positive effects（正面影响）（正面影响）Negative effects(负面影响）20ppt课件1.

11、cause the sea level to rise2.severe storms3.floods4.droughts5.famines6.the spread of diseases7.disappearance of speciesPositive effects Negative effects 21ppt课件The sea level to rise.22ppt课件Severe stormsdroughtsfaminesthe spread of diseases23ppt课件disappearance of species24ppt课件1.cause the sea level t

12、o rise2.severe storms3.floods4.droughts5.famines6.the spread of diseases7.disappearance of speciesPositive effects Negative effects 1.make plants grow quicker2.crops will produce more3.a greater range of animals4.make life better25ppt课件Summary HowEffects 26ppt课件1.Human activities2.Greenhouse gases27ppt课件Homework1.Read the text again,and try to retell it.2.Find out the difficult sentences in the passage.28ppt课件 It is everyones duty to make a contribution to our environment.29ppt课件 30ppt课件