Step 3: Pre-reading

1. What is the greenhouse made and used for?

　　A greenhouse is made of glass and is used for growing plants, especially during cold weather.

2. How does it work?

　　The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period.

3. What are the "greenhouse gases"?

In the atmosphere surrounding the earth there are gases called "greenhouse gases", including carbon dioxide, methane (甲烷, 沼气) and water vapor.

4. What do you think greenhouse gases do?

They trap the heat of the sun and keep the air surrounding the earth warm.

Step 4: Reading

1. Skimming: Glance quickly at the magazine article and answer the questions.

(1) Who wrote the magazine article? What is the name of the magazine?

(2) What are the names of the three scientists mentioned in the article?

(3) What do they think about global warming? Do they agree with one another?

(4) What are the two graphs about?

(5) What is the main topic of the article?

2. Careful reading

Task1: Read the article carefully. Are these statements true or false?

(2) The temperature in the last century did not seem to increase much. T

(2) Everyone believes that global warming is caused by the activities of humans. F

(3) Janice Foster believes that she can measure the future global rise in temperature. F

(4) The rise in carbon dioxide is causing a steady increase in global warming. T

(5) George Hambley believes that global warming will do good rather than harm to the earth. F