人教版高中英语选修六UNIT-4-reading课件

1、Unit 4Unit 4Global Warmingenergy 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. stove light things that use ener

2、gy in your home micro-wave oven cassette player heating television hairdryer video player fridge computer washing machine stovethings that use energy in our life heating hairdryer fridge televisionthings that use energy in our life washing machine electromagnetic oven electric fanDo you know how ene

3、rgy is produced?How many sources of energy can you list?Wind energy is used as power to produce electricity . Windmillswhere electricity is produced by burning coals.The coal power stationsin which oil is refined and made pure. The Oil Refineriesa facility designed to convert nuclear energy into ele

4、ctricity.A nuclear power plant 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 panelsare used to keep back water and raise its level for irrigation or for producing electricity, etc.The Hydro-electric dams An energy so

5、urce 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 Wind (wind power) Sun (solar energy) Water (hydro-electric power) Plant waste 植物性废物植物性废物 (biomass energy 生

6、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 )RenewableAre they renewable or non-renewable?wind energy renewablesolar energy renewable hydroelectric power renewablegeothermal energyrenewable tidal energy renewable biomass energyrenewableCoalOilNatural ga

7、sUranium化化铀铀 (nuclear energy)Fossil fuels Non-renewablenuclear power plant non-renewablean oil refinery(精炼厂精炼厂) non-renewablecoal power station non-renewablenatural gasnon-renewableuranium Ore (铀矿石铀矿石)non-renewableWhat are fossil fuels? Fossil fuels are Ancient animal and plant material below the su

8、rface 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.1. Have you ever seen a greenhouse?is made of glass used for growing p

9、lants, especially during cold weather.2. How does the greenhouse work?The 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(在在期间期间) the cold period.4. Green

10、house EffectGlobal warmingGreenhouse gases trapped the heat from the sun, which causes the temperature of earth goes up. The Earth Is The Earth Is Becoming Warmer Becoming Warmer But Does It But Does It Matter?Matter? Scanning Reading tips skim the title and Para 1: Title: THE EARTH IS BECOMING WARM

11、ER BUT DOES IT MATTER?Para 1: how has this come about and does it matter?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(二二氧化碳含量氧化碳含量) in the atmosphere from 1957 to 1997.Graph 1:Graph 2: 1) How many paragra

12、phs 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-Reading1. the topic sentences of each paragraph. So how has this come about and does it matter? that it is human activity that has caused this global

13、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 the burning of more and more fos

14、sil 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 tohappenParagraph 1Paragraphs 2&5Paragraph 6Part1Part2Part42.Main idea

15、 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? Reading tips: In English, some nouns begin with a capital letter(大写字母大写字母), such as names of people and places, titles(标题

16、标题) of magazines, newspapers, stories and books, peoples titles(头衔头衔), etc.global warmingPara.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 The burning of more and

17、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.The attitudes of scientists to/towards the riseDr Foster George HamblyAttitudeReasonsThe trend which increase the temperature by 5 degrees wou

18、ld 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 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 w

19、ill 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 better.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 h

20、appen 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 not1. 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

21、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 environmental consequences. 5. Greenhouse gases continue to build up in the atmosphere.Fact or Opinion?( O )( F )( O)( O )( F )Choose the best answers.1.Who found out the

22、amount of carbon dioxide in the atmosphere from 1957 to 1997?A. Dr. Janice Foster. B. Charles Keeling.C. George Hambley. D. Sophie Armstrong.2.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 c

23、aused by the 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.Step V Summary The earth is becoming warm and all scientists _ _ the view that the increase in the earths temperature is due to the burn

24、ing 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 energy _ to be trapped in the atmosphere causing the global temperature to _. A scientist called Charles Keeling found tha