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1、Unit 4 Global warmingPeriod 1 Energy resourcesDo you know any kind of energy resource? Talk with your neighbors and write down as many as you can. Less than 1 min for you only.Check your answers and think whether they are renewable or non-renewable.Windmills, renewable.What? Renewable?What? What kin
2、d? Renewable?A coal power station , non-renewable.What? What kind? Renewable?An oil refinery(精炼厂), non-renewable.What? What kind? Renewable?A nuclear power plant, non-renewable.What? What kind? Renewable? Solar panels, renewable.What? What kind? Renewable?A hydro-electric dam, renewable.Guess it! Ur
3、anium Ore (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）, pictured here.What source of energy?Geysers(间歇泉)Geothermal (地热的) Energy Plant Thermal(温泉的温泉的) Region,IcelandNon-renewable RenewableCoalOilNatural gasUraniumWind (wind power)Sun
4、(solar energy)Water (hydro-electric power)Plant waste (biomass energy)Hot springs or geysers (geothermal energy)The sea (tidal energy)Fossil fuelsWhat are fossil fuels?Ancient animal and plant material below the surface of the earth with a high carbon content, such as coal, oil and natural gas, whic
5、h can be burnt to produce energy. Also known as non-renewable energy because once they are used they have gone forever; they cannot be renewed.What about the weather?9 / 14We needThe sun.精品课件 How about the plants?精品课件If lack of solar energy, the plantsGreenhouse精品课件Greenhouse gases!What are greenhou
6、se gases?Whats greenhouse effect?精品课件精品课件Read the passage quicklyWho wrote? Whats the name of the magazine?What are the names of the three scientists mentioned?Is the global warming terrible?What are the two graphs about?Whats the main topic of the article?精品课件 Who wrote? Whats the name of the magaz
7、ine?Sophie Armstrong. “Earth Care”.What are the names of the three scientists mentioned?Dr Janice Foster, Charles Keeling, George Hambley.精品课件 Is the global warming terrible?Different.What are the two graphs about?The first graph shows the temperature of one degree Fahrenheit between 1860-2000.The S
8、econd graph shows the carbon dioxide content in the atmosphere from 1957-1997.精品课件 Whats the main topic of the article?Global warming/ the warming of the earth.精品课件True or false!The temperature last century didnt increase much.Everyone believes that global warming is caused by the activities of huma
9、ns.Janice Foster believes that global warming is caused by burning fossil fuels.Natural gas is a greenhouse gas.Carbon dioxide is a byproduct of burning fossil fuels.精品课件 People accept Charles Keelings data because he took accurate measurements.Flooding could be one of the effects of future global w
10、arming.George Hambley believes scientists are just guessing about the effects of global warming.精品课件 George Hambley is worried about the effects of carbon dioxide on plant growth.It is clear what the effects of global warming will be.精品课件Read for the details.Whats the main idea of the passage? The _
11、 have different ideas on whether it _ when the earth is becoming _.scientistsmatterswarmer精品课件Parts.Part 1( Para 1): There is a fierce debate over what has caused this global warming.Part 2 (Para 2-7)Some scientists think that global warming could be serious.Part 3 (Para 8)Some think that we should
12、not worry much about global warming.精品课件Parts.Part 4 (Para 9):No one knows what is the effects of global warming will be.精品课件Yes or no?Does Sophie Armstrong support a clear opinion?No. he doesnt state it clearly.Does George Hambley believe that we should worry much about the global warming?No, he do
13、esnt.精品课件Choices.1. Who found out the amount of carbon dioxide in the atmosphere from 1957 to 1977?A. Dr. Janice Foster. B. Charles Keeling.C. George Hambley. D. Sophie Armstrong.B精品课件 2. But there are some very different attitudes among scientists towards this issue.“ Issue here means the same as t
14、he one in_.A. I bought the new stamp the day of its issue. B. They are talking about one of the key issues in the election campaign.C. The government is expected to issue a statement about the election.D. The magazine has 12 issues each year.B精品课件 3. The author probably agrees that _A. actually glob
15、al warming is good for man.B. we should do nothing about the global warming.C. catastrophes will happen if the globe keeps on warming.D. a lot remains to be found out about the effects of global warming.D精品课件The different ideas between Dr. Janice Foster & George Hambley Dr. Janice FosterGeorge Hambl
16、eyCarbon dioxide has caused 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 en- courage _.go upcatastropheVery seriouspositiveproducea greater range of animals精品课件HomeworkPrepare the language points of this passage and underline the important ones.After remembering the vocabulary, do the exercise on Page 28.