高二英语人教课标选修6unit4gramma.pptVIP

Unit 4 Global Warming,,How did come about?,the snow catastrophe,Some scientists believed that global warming was one of the major reasons why such extreme climate like severe storms and heavy snow frequently came about.,,Think about :,What causes global warming? Human activity or a random but natural phenomenon?,When we talk about this problem, we naturally link it to the use of energy and the environmental pollution.,,But firstly and importantly, energy makes a great difference to our lives. What things do we use energy for?,We _energy to do many things in our lives. For axample, energy _our cities and _our buildings. What other things do we use energy for?,depend on,lights,heats,Things that use energy around us or at any other places:,In a house,,Where does all this energy come from?,,Place and the related energy,Wind power,wind,,Place and the related energy,a coal power station,coal,,Place and the related energy,oil refinery （提炼厂）,oil,,Place and the related energy,nuclear power station,Uranium 铀,,Place and the related energy,solar panels （镶板）,solar power,,Place and the related energy,a hydro-electric power（与水有关的）,water,,Energy at home,school ,sources of energy,things using energy,Lights Heating Television Cassette player Video recorder Computer Fridge Stove Washing machine Hairdryer,Coal Oil Natural gas Wind (wind power) Sun (solar energy) Uranium (nuclear energy) Water (hydro-electric power),,Energy at home, school ,sources of energy,renewable or non-renewable,Coal Oil Natural gas Wind (wind power) Sun (solar energy) Uranium (nuclear energy) Water (hydro-electric power),Non-renewable Non-renewable Non-renewable Renewable Renewable Non-renewable Renewable,,Lets try to save energy! To save energy is to save our earth!,Sloganslugn -,n. 标语,口号,,As we know, coal, oil and natural gas are called _ , which is a kind of energy. It can make a great _to our lives. But do you know what by_ is produced when we burn fossil fuel? Is it good for our planet? What ph_ is caused by it?,difference,enomenon,product,fossil fuel,,Fossil Fuel,,Fossil Fuel,coal,oil,natural gas, ,Why?,,Picture reading,A greenhouse,greenhouse,,Picture reading,A greenhouse is made of _ and is used for growing _, especially during _ weather.,What is a greenhouse made of and used for?,glass,plants,cold,,The air inside is warm because the glass _ the heat from the sun and keeps it from _. This makes the greenhouse _ and so the plants can grow _.,traps,escaping,heat up,throughout the cold period,How does a greenhouse work?,,Now can you connect global warming with greenhouse and think of the relationship between them? Maybe you can understand why we call global warming “greenhouse effect”, right?,Whats greenhouse effect?,greenhouse effect,Surely we need greenhouse gases. Without greenhouse effect, the earth would be_.,In the atmosphere surroudning the earth there are gases called “greenhouse gases”. What do you think greenhouse gases do?,It is a pity that human activity gives off extra _into the atmosphere therefore it causes_.,too cold,carbon dioxide,global warming,,Reading,,Task 1 Skimming,Skim the title: THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?,What is the main topic? A. The earth. B. Global warming. C. Becoming warmer doesnt matter.,,Sophie Armstrong,Earth Care,Dr Janice Foster, Charles Keeling, George Hambley,P 27 Ex.1 Listen to the magazine article and answer the following questions. Comprehending One,,Skimming,The organization of an expositive:,Introduction,A title,Body,Conclusion,,Skimming,Skim the main text:,Para. 1,Para. 2-3,I,II,Para. 4-8,III,Para. 9,IV,Introduction,Body,Conclusion,,Skimming,Match the parts with the main ideas:,Explain how global warming comes about.,List two different attitudes among scientists towards global warming.,Introduce a debate over global warming.,Its up to readers to think and decide whether people should do something about global warming or not.,,Scanning,Match the parts with the writing skills:,Using a question, leaving readers to think over the issue,Raising a question,Giving examples, making contrast (comparison),Giving examples, using graphs, explanation,I (1),II (2-3),III (4-8),IV (9),,Page 27 Ex.2 T or F,1.The temperature in the last century didnt seem to 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 in temperatrue 4. The rise in carbon dioxide is causing a steady in crease in global warming. 5. George Hambley believes scientists are just guessing about the effects of global warming. 6. It is clear what the effects of global warming will be.,1.The temperature in the last century didnt seem to 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 in temperatrue,T,T,F,Line 2: it is a rapid increase compared to most natural changes,Line 5 : There is doubt that,4. The rise in carbon dioxide is causing a steady in crease in global warming. 5.