选修6_global_warming_单元课件

1、Unit 4 Global Warmingwarming-up&ReadingEnergy sources?International relations? Money?Technology? Which is the most important to a country? Man power?energy sourcesWe 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 t

2、hings that use energy in your home, in your school, or any other places you can think of. stove light things that use energy in your home micro-wave oven cassette player heating television hairdryer video player fridge computer washing machine stoveWind energy is used as power toproduce electricity

3、. Windmillswhere electricity is produced by burning coals.The coal power stationsa facility designed to convert nuclear energy into electricity.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 pane

4、lsare used to keep back water and raise its level for irrigation or for producing electricity, etc.The Hydro-electric damsGuess it! Uranium Ore (铀矿石铀矿石) The element uranium does not occur in pure form in nature but is found in minerals such as carnotite（钒钾铀矿钒钾铀矿）, pictured here.What source of energy

5、?Geysers(间歇泉间歇泉)Geothermal (地热的地热的) Energy Plant 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? Discussnon-renewablerenewableWhat are these buildings ma

6、de of and what are they called?Whats the use? glass / greenhouseA greenhouse is used for growing plants, especially during cold weather.The glass traps the heat from the sun, making the air warm so that plants can grow better.trapfrom: keep sth in a place 存住存住中的中的How does it workGreenhouse gases?In

7、the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”, mainly including _, and water vapor(水蒸气水蒸气).carbon dioxideCarbon dioxideMethaneWater vaporWhat do you think greenhouse gases do?Greenhouse gases perform the same function as the _in a greenhouse - They _the he

8、at of the sun and therefore _the earth.It is known as_.Nowadays our earth is becoming _.greenhouse effecttrapwarmwarmer and warmerglassP26The Earth is Becoming Warmer- But Does It Matter?Fast readingThis article is from _.a. a magazineb. the internet c. a book It has a title, a first paragraph that

9、runs across the page and is in bold, the main text in two columns, graphs/diagrams, two quotes.What is the structure of a magazine like this and how is the text organized? 1. What is the purpose of the paragraph that is in bold?To introduce the topic.To illustrate(阐述阐述) points by providing evidence.

10、2. What are the diagrams for?Questionnaires -I3. Why are there two quotes?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 functions as a conclusion by asking t

11、he reader to reflect on the major theme of the text and to predict what might happen in the future. 4. What is the purpose of the last paragraph of the article?Sophie Armstrong, Earth Care.Global warming.1.Who wrote the magazine article? What is the name of the magazine? 2. What is the main topic of

12、 the article?Glance and Answer! Dr Janice Foster; Charles Keeling; George Hambley. 3. What are the names of the three scientists mentioned in the article?Glance and Answer!4.What are the two graphs about?Graph 1 shows the temperature increase of one degree Fahrenheit between 1860 to 2000.Graph 2 sho

13、ws the carbon dioxide content in the atmosphere from 1957 to 1997.Graph 1:Graph 2:True and False?P27-21.The temperature last century didnt increase much.2.Everyone believes that global warming is caused by the activities of humans.3.Janice Foster believes that she can measure the future global rise

14、in temperature.4.Natural gas is a greenhouse gas.5.Carbon dioxide is a byproduct of burning fossil fuels.Tell true or false.TTFTTWhat attitudes among scientiststowards global warming?The different ideas between Dr. Janice Foster & George Hambley Dr. Janice FosterGeorge HambleyCarbon dioxide has caus

15、ed the global temperature to _. An increase of five degrees would be a _ and could be _.More carbon dioxide is a _ thing,which makes crops _ and will encourage _.go upcatastrophe very seriouspositiveproducea greater range of animalsSome peopleothersThe sea level _.predict_,_,_,_, and _.rise by sever

16、al metressevere stormsdroughtsfamines the spread of diseases the disppearance of species Other peoples ideafloodsMaybe The sea level will rise.MaybeThere will be some disasters,such asFlood!DroughtFamineForest Fire!Discussion: What are the effects of global warming? Bad points:v 1. The sea level to

17、rise v 2.Severe storms,droughts,floods, famines,the spread of diseases and the destruction of species.Good points:1.Make plants grow faster2.Crops will produce more3.Encourage a greater range of animalsYes or no?2. Should we do anything about global warming?1.Do you think the risks of global warming

18、 are great? Debate We should do something about global warming.We should do nothing about global warming.Group A :Group B :Agreement & Disagreement Exactly. All right. Thats right. Thats a good idea. I think so. I couldnt agree more. Thats exactly my opinion. I dont think so. Im afraid not. Im afraid I disagree with you. Im afraid I have a different opinion. I think you are absolutely wrong.Overpopulation water pollutionwater pollutionDeforestation and desertificationDeforestation and desertification采伐森林采伐森林 沙漠化沙漠化Energy shortageOzone(Ozone(臭氧）臭氧）loss and loss an