Unit 22 Environmental Protection
Lesson 1 Global Warming---教案 
Teaching aims: 
By the end of this lesson, students will
1.   have a better understanding of what global warming is 
2.   know the serious consequences that global warming may cause
3.   realize the importance that we need to take action
Teaching methods:
Prediction, pair work, fast reading, careful reading, group discussion
Teaching aids:
Some slides, a projector, a computer
Teaching procedures:
Step 1 pre-reading
1. Lead- in
Use some cartoons to lead to the topic--- Global Warming.
Ask students how much information they know about global warming and which countries contribute more to global warming: developed countries or developing countries.