We can show some slides suggesting global warming ,we can use scanning to ask questions about the cause, the two different attitudes, we can use detailed reading to further understand the text. we can also adopt group work to discuss the effect of global warming.

Step 1 Lead -in

　　T: enjoy a video of global warming , ask students why the ice-cream melt

　　SS: It is because global warming and global warming is because of greenhouse effect

　　.设计意图：激发学生学习兴趣，为阅读课文做好铺垫。

　　Step 2 Skimming

1 the structure of the passage

1 introduction

　　2 body

　　3 conclusion

2 Match the main idea of each part

　　Part 1 The earth is becoming warmer.

　　Part 2 How has global warming come about ?

　　Part List two different attitudes .

part 4 Should we do anything?