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1、Task 1. Ss in pairs, talk about the greenhouse and answer the following questions:What is a greenhouse? How does it work?What do you think greenhouse gases do?TASK 2. PREDICTING: SS READ THE TITLE AND PREDICT WHAT THE TEXT WILL TELL.Task 3: Ss read the passage and judge the following sentences: true

2、 of false.1.The temperature last century didnt increase much.2.Everyone believes that global warming is caused by the activities of humans.3.Janice Foster believes that global warming is caused by burning fossil fuels.4.Natural gas is greenhouse gas.5.Carbon dioxide is a byproduct of burning fossil

3、fuels. FFTFT6. People accept Charles Keelings data because he tok accurate measurements.7. Flooding could be one of the effects kof future global warming.8. George Hambley believes scientists are just guessing about the effects of global warming.9. Gorge Hambley is worried about the effects of carbo

4、n dioxide on plant growth.10. It is clear what the effects of global warming will be.TTTFFTask 4. Ss read the passage again and try to divide the whole passage into several parts and summarize the main idea for each part. While reading, pay attention to the writing skills.Main ideas of each part Wri

5、ting skills Writing skills Introduce a debate over the issue of global warming. (paragraph 1) Raising a question Illustrate how global warming comes about. (paragraphs 2-4) Giving examples, using graphs, explanation.List two different attitudes among scientists towards global warming. (paragraphs 5-

6、10) Giving examples, making contrast.Its up to readers to think and decide whether people should do something about global warming or not. (paragraph 11) Using a question, leaving readers to think over the issue.Task 5. Debate: get the Ss to debate over the statement: We should do nothing about global warming.Debate