高中英语Unit4GlobalWarmingReadingTheEarthIsBecomingWarmer-ButDoesItMatter教学课件新人教版选修.ppt

1、Unit4,Global Warming,The Earth is Becoming Warmer -But Does It Matter?,Explore the cause of global warming,1,Page 3,Learn different attitudes towards global warming,2,Aims,Go through the text and think about how to divide the whole passage according to the main idea.,Paragraph 1,Paragraphs 2&5,Parag

2、raph 6,Main idea of the text,Paragraph 7,How has global warming come about?,List two different attitudes among scientists towards global warming.,The earth is becoming warmer,Should we do anything?,The earth is becoming warmer.,How has global warming come about?,List two different attitudes among sc

3、ientists towards global warming.,Should we do anything?,Part2 Para 2&5,Part3 Para 6,Part4 Para 7,Part1 Para 1,Main idea of the text,Para.1:,Question : How has this global warming come about?,Para.2,It is human activity that has caused this global warming rather than a random but natural phenomenon.,

4、全球变暖正是人类活动导致而成的，而不是随意的自然现象。,How has human activity caused this global warming?,Look at the two graphs .,Graph 1:,Graph 2:,1957,315,From the two graphs, can you find some relationship between them?,The more CO2, the higher temperature.,Why does more CO2 cause higher temperature?,Graph 1:,Graph 2:,Gre

5、enhouse gases _ the heat of the sun and therefore _ the earth. It is known as _.,greenhouse effect,trap,warm,Is “Greenhouse effect” beneficial or harmful to us?,Para.3 (Line 24-36),Fossil Fuel,coal,oil,gas, ,produce,Why is extra carbon dioxide added into the atmosphere?,Para.3 (Line 18-23)& Para.5,I

6、s “global warming” beneficial or harmful to us? Does it matter?,Para.6,Negative effects,disappearance of species,Positive effects,make plants grow quicker,crops will produce more,a greater range of animals,make life better,cause the sea level to rise severe storms floods droughts famines the spread

7、of diseases disappearance of species,Positive effects,Negative effects,make plants grow quicker crops will produce more a greater range of animals make life better,Game: Run a choo-choo train,Group1,Group2,Group3,cause the sea level to rise severe storms floods droughts famines the spread of diseases disappearance of species,Positive effects,Negative effects,make plants grow quicker crops will produce more a greater range of animals make life better,Search for some more materials and think about whats your attit