人教版高中英语选修六UNIT-4-reading课件.ppt（纯ppt,可能不含音视频素材）

1、.1Unit 4Unit 4Global Warming.2energy sources We depend on energy to do many things in our daily lives.For example,energy lights our cities and heats our buildings.Make a list of things that use energy in your home,in your school,or any other places you can think of.3stove light things that use energ

2、y in your home micro-wave oven cassette player heating television hairdryer video player fridge computer washing machine stove.4things that use energy in our life heating hairdryer fridge television.5things that use energy in our life washing machine electromagnetic oven electric fan.6Do you know ho

3、w energy is produced?How many sources of energy can you list?.7Wind energy is used as power to produce electricity.Windmills.8where electricity is produced by burning coals.The coal power stations.9in which oil is refined and made pure.The Oil Refineries.10a facility designed to convert nuclear ener

4、gy into electricity.A nuclear power plant.11 on the roof of a house on a bright sunny day are used to collect solar energy,making your house warm or heating your water.Solar panels.12are used to keep back water and raise its level for irrigation or for producing electricity,etc.The Hydro-electric da

5、ms.13 An energy source is“renewable”when supplies of it never run out and“non-renewable”when one day they will run out.Which energy sources on your list are renewable and which are non-renewable?Discussion.14 Wind(wind power)Sun(solar energy)Water(hydro-electric power)Plant waste 植物性废物植物性废物 (biomass

6、 energy 生物团能量生物团能量)Hot springs or geysers 间歇泉间歇泉 (geothermal energy)The sea(tidal energy 潮汐能潮汐能)Renewable.15Are they renewable or non-renewable?.16wind energy renewable.17solar energy renewable.18hydroelectric power renewable.19geothermal energyrenewable.20tidal energy renewable.21biomass energyrene

7、wable.22CoalOilNatural gasUranium化化铀铀(nuclear energy)Fossil fuels Non-renewable.23nuclear power plant non-renewable.24an oil refinery(精炼厂精炼厂)non-renewable.25coal power station non-renewable.26natural gasnon-renewable.27uranium Ore(铀矿石铀矿石)non-renewable.28What are fossil fuels?Fossil fuels are Ancient

8、 animal and plant material below the surface of the earth with a high carbon content,such as coal,oil and natural gas,which can be burnt to produce energy.They are also known as non-renewable energy because once they are run out of/run out,they cannot be renewed.291.Have you ever seen a greenhouse?i

9、s made of glass used for growing plants,especially during cold weather.302.How does the greenhouse work?.31The air inside was warm because the glass traps(挡住挡住,吸收吸收)the heat from the sun and keeps it from escaping(逃跑逃跑).This makes the greenhouse heat up(热量热量上升上升)and so the plants can grow throughout

10、(在在期间期间)the cold period.324.Greenhouse EffectGlobal warmingGreenhouse gases trapped the heat from the sun,which causes the temperature of earth goes up.33The Earth Is The Earth Is Becoming Warmer Becoming Warmer But Does It But Does It Matter?Matter?.34 Scanning.35Reading tips skim the title and Par

11、a 1:Title:THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?Para 1:how has this come about and does it matter?.36What 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(二二氧化碳含量氧化碳含量)in the atmosphere from 1957 to 1997.G

12、raph 1:Graph 2:.37 1)How many paragraphs does the reading text consist of?Please find out the topic sentence of each para.Read the passage quickly(3)2)Make a division of the text.Fast-Reading.381.the topic sentences of each paragraph.So how has this come about and does it matter?that it is human act

13、ivity 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 increased greatly over the last 100 to 150 years.it is t

14、he 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?agreeled tohappen.39Paragraph 1Paragraphs 2&5Paragraph 6

15、Part1Part2Part42.Main idea of each partPart3Paragraph 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 anything?.40 Reading tips:In English,some nouns begin with a capital letter(大写字母大写字母),such as names of peo

16、ple and places,titles(标题标题)of magazines,newspapers,stories and books,peoples titles(头衔头衔),etc.global warming.41Para.2 Human activity has caused global warming.Para.3 The increase of temperature is due to the burning of fossil fuels.Para.4 The levels of carbon dioxide have increased greatly.Para.5 Th

17、e 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.42The attitudes of scientists to/towards the riseThe trend which increase the temperature by 5 degrees would be a catast

18、rophe.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 rise 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 gr

19、ow quicker;crops will produce more;It will encourage a greater range of animals-all of which will make life for human beings better.43The 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 kee

20、ps on warming.D.a lot remains to be found out about the effects of global warming.Choices:to do sth.or not.44 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 fiv

21、e degrees in the amount of warming would be a catastrophe.4.Any warming will be mild with few bad environmental consequences.5.Greenhouse gases continue to build up in the atmosphere.Fact or Opinion?(O)(F)(O)(O)(F).45Choose the best answers.Who found out the amount of carbon dioxide in the atmospher

22、e from 1957 to 1997?A.Dr.Janice Foster.B.Charles Keeling.C.George Hambley.D.Sophie Armstrong.462.What is NOT true according to the passage?The rise in carbon dioxide is causing an increase in global warming.B.Everyone believes that global warming is caused by the activities of human.C.George Hambley

23、 believes that global warming will do good to the earth.A.D.It is clear what the effects of global warming will be.47Step V Summary The earth is becoming warm and all scientists _ _ the view that the increase in the earths temperature is due to the burning of _.Some _ of this process are called _,th

24、e 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 energy _ to be trapped in the atmosphere causing the global temperature to _.A scientist called Charles Keeling found that the carbon diox

25、ide in the atmosphere went up from around subscribe tofuelsgreenhouse gasesbyproductscarbon dioxidequantities oftendsgo upfossil.48315 parts to around 370 parts _ million in 40 years.All scientists accept the date and agree the burning of more and more fossil fuels has _ this increase.However,the at

26、titude of scientists towards this rise is completely different.On the one hand,Dr.Foster thinks that the _ which increases the temperature by 5 degrees 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