1、Warming up,Words and expressions,Fossil fuel (化石燃料) : Ancient 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; also known as non-renewable energy because once they are used they have gone for
2、ever; they cannot be renewed.,What are fossil fuels?,From the following pictures, you will know where all this energy comes from.,windmills(风车),a coal power station,an oil refinery,a nuclear power plant,solar panels,a hydro-electric dam,Sample lists,light heating television cassette player video rec
3、order,oil,coal,natural gas,wind (wind power),sun (solar energy),renewable,renewable,non-renewable,non-renewable,non-renewable,fridge,stove,washing machine,hair- dryer,water( hydro-electric),renewable,plant waste (biomass energy),renewable,hot springs or geysers (geothermal energy),renewable,the sea
4、(tidal energy),renewable,computer,uranium (nuclear energy),non- renewable,Renewable or non-renewable?,Renewable or non-renewable?,What is told in the picture?,non-renewable energy source,Notes to Renewable energyRenewable energy resources may be used directly, or used to create other more convenient
5、 forms of energy. Examples of direct use are solar ovens, geothermal (地温) heating, and water and windmills.,Examples of indirect use which require energy harvesting are electricity generation through wind turbines(涡轮) or photovoltaic(光电的) cells, or production of fuels such as ethanol(酒精) from biomas
6、s(生物量).,Renewable energy (sources) or RES capture their energy from existing flows of energy, from on-going natural processes, such as sunshine, wind, flowing water, biological processes, and geothermal heat flows.,Most renewable energy, other than geothermal and tidal power, ultimately(基本上)come fro
7、m the Sun. Some forms are stored solar energy such as rainfall and wind power which are considered short-term solar-energy storage,whereas the energy in biomass(生物量) is accumulated(积聚) over a period of months, as in straw, or through many years as in wood.,Capturing renewable energy by plants, anima
8、ls and humans does not permanently deplete(耗尽) the resource. Fossil fuels, while theoretically renewable on a very long time-scale, are exploited at rates that may deplete these resources in the near future.,1.Have you ever seen a greenhouse?,Pre-reading,2.What is the greenhouse made and used for?,A
9、 greenhouse is made of glass and is used for growing plants, especially (特别，尤其)during cold weather.,3.How does the greenhouse work?,The air inside was warm because the glass traps(挡住，吸收) the heat from the sun and keeps it from escaping（逃跑）. This makes the greenhouse heat up（热量上升） and so the plants c
10、an grow throughout(在期间) the cold period.,2018/12/28,What are the “greenhouse gases”? What do you think greenhouse gases do?,Greenhouse Gases,2018/12/28,greenhouse effect,2018/12/28,Greenhouse,Atmosphere,Glance quickly at the magazine article and answer the questions.,1.Who wrote the magazine article
11、? What is the name of the magazine?,Sophie Armstrong. Earth Care.,2.What are the names of the three scientistsmentioned in the article?,Dr Janice Foster, Charles Keeling, George Hambley.,3. What do they think about global warming? Dothey agree with one another?,There are some very different attitude
12、s among scientists towards this issue. Some think the effects will be terrible, while some others believe that we should not worry about it.,4. What are the two graphs about?,Graph1 shows the temperature increase of one degree Fahrenheit between 1860 to 2000. Graph2 shows the carbon dioxide content
13、in the atmosphere from 1957 to 1997.,5. What is the main topic of the article?,Global warming,Construct,Main ideas of each part,Part1 (1),Introduce a debate over the issue of global warming.,Read the passage carefully and judge whether the statements are true or false? The temperature in the last ce
14、ntury did not seem to increase much. Everyone believes that global warming is caused by the activities of humans. Janice Foster believes that she can measure the future global rise in temperature.,F,T,T,4.The rise in carbon dioxide is causing a steady increase in global warming. 5.George Hambley bel
15、ieves that global warming will do good rather than harm to the earth. 6. It is clear what the effects of global warming will be.,T,T,F,1. Greenhouse gases refer to _.A. carbon dioxide B. the burning of fossil fuelsC. byproducts of the burning of fossil fuelsD. coal, natural gas and oil,C,Scanning,2.
16、 Greenhouse effect _.A. is a natural phenomenon B. happens when theres too much carbon dioxide C. does great harm to human beingsD. makes life for human beings better,A,3. Which of the following is TRUE according to the text? A. The temperature of the earth increased about one degree Fahrenheit duri
17、ng the 20th century. B. The carbon dioxide content in the air increased by 70 parts per million from 1957 to 1997. C. All scientists accept the data in graph 2 except Charles Keeling. D. Janice Foster says that more carbon dioxide will make plants grow faster.,A,4. Which of the following is Dr Janic
18、e Fosters opinion? A. The result of the temperature increase will be serious. B. The amount of warming is nothing serious. C. We neednt worry about high levels of carbon dioxide. D. Global warming is a natural phenomenon.,A,5. _ found out the amount of carbon dioxide in the atmosphere from 1957 to19
19、77.A. Dr. Janice Foster B. Charles KeelingC. George Hambley D. Sophie Armstrong,A,6. The author probably agrees that _. A. actually global warming is goodfor manB. we should do nothing about theglobal warming C. catastrophes will happen if theglobe keeps on warming D. a lot remains to be found outab
20、out the effects of global warming,D,1. How has the global warming come about?, Human activity- burning of fossil fuels., Greenhouse effect- greenhouse gases- we need those gases., Huge quantities of extra carbon dioxide-from 1957 to 1997-from around 315 parts per million to around 370 parts per mill
21、ion.,2.What are the effects of global warming?, Encourage a greater range of animals.,The sea level to rise., Severe storms, droughts, famines, the spread of diseases, and destruction of species., Make plants grow faster. Crops will produce more.,The different ideas between Dr. Janice Foster & Georg
22、e Hambley,go up,catastrophe,very serious,positive,produce more,a greater range of animals,Summary,Skim over the passage, and tell what you have learnt in class.,e.g: I learnt that the earth is becoming warmer.I learnt that global warming could have terrible effects on the environment.,Assignment,Read the passage again and review the new words and expressions. Prepare the debate in groups. Surf the Internet for more information about global warming.,Have a rest,