3) Give a graph2, ask one student to analyze the graph2 as the way of graph1. Then combined with Paragraph4 and Paragraph5, judge T or F.

The carbon dioxide content in the air increased by 70 parts per million from 1957 to 1997.

All scientists accept the data in graph 2 except Charles Keeling.

4) Read paragraph6 together and summarize the different attitudes towards global warming.

Dr.Foster: It would lead to a catastrophe.

George Hambly: We should not worry about it.

5) Read paragraph7 independently and answer questions.

If we start reducing the amount of carbon dioxide and other greenhouse gases, is the climate going to stop?

What's the attitude of the author? Positive?Negative or Neutral?

6) Summarize the structure of the whole passage

Part1 (paragraph1)

Part2 (Paragraph2-5)

Part3 (Paragraph6)

Part4 (Paragraph7)

Step 5 Writing

Write down the advantage or disadvantage of global warming in your opinion.

Step 6 Play a video to express my view.