1、Unit 4 Global warming,What cause the global warming?,the use of energy,give off carbon dioxide, other wasted gases and heat into the air,The earth is becoming warmer and warmer. (globle warming),Greenhouse effect,How does a greenhouse work?,The greenhouse trap the heat from the sun and keeps it from

2、 escaping, which can make it heat up and so the plants can grow throughout the cold period.,Greenhouse ?,Under this greenhouse effect, the earth is becoming warmer and warmer.,But does it matter?,The earth is becoming warmer -but does it matter?,Para. 1: (1)Where does this text from? (2)Who wrote th

3、is text?,Sophie Armstrong,a magazine named Earth Care,Part one: Part two: Part three: Part four:,Introduce a debate over the issue of global warming.,How global warming comes about.,No one knows what the effects of global warming will be.,Para.1,Para. 2-4,Two different attitudes among scientists tow

4、ards global warming.,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.,But there are some very different attitudes among scientists towards this issue.“ “issue here means the same as the o

5、ne in _. A. I bought the new stamp the day of its issue. B. What health issues do you think concern young people the most? C. The government is expected to issue a statement about the election. D. The magazine has 12 issues each year.,n. 期號,n.發(fā)行,n. topic 議題,爭論點,v. 發(fā)布,The different ideas between Dr.

6、Janice Foster & George Hambley,go up,catastrophe,very serious,positive,produce more,a greater range of animals,Does George Hambley believe that we should worry much about the global warming? No, he doesnt.,Part one: Part two: Part three: Part four:,Introduce a debate over the issue of global warming

7、.,How global warming comes about.,No one knows what the effects of global warming will be.,Para.1,Para. 2-4,Para.5-10,Two different attitudes among scientists towards global warming.,Part one: Part two: Part three: Part four:,Introduce a debate over the issue of global warming.,How global warming co

8、mes about.,No one knows what the effects of global warming will be.,Para.1,Para. 2-4,Para.11,Para.5-10,Two different attitudes among scientists towards global warming.,The author Sophie Armstrong probably agrees that _ A. actually global warming is good for man. B. we should do nothing about the glo

9、bal 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.,T or F exercise : P27,The temperature last century didnt increase much . Everyone believes that global warming is caused by the activities of humans. Janice F

10、oster 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.,F,F,T,F,T,6 People accept Charles Keelings data because he took accurate measurements . 7 Flooding could be one of the effects of future glo

11、bal warming . 8 George Hambley believes scientists are just guessing about the effects of global warming . 9 George Hambley is worried about the effects of carbon dioxide on plant growth . 10 It is clear what the effects of global warming will be .,T,T,T,F,F,the main idea of the passage: A. When the “greenhouse effect” started B. What causes the “greenhouse effect” C. Dr. Janice Fosters theory on the “greenhouse effect” D. The fact that the earth is becoming warmer and different theories about it.,Do you think it is possible that the winter will disapp