1. 人教课标
高二 选修 6
Unit 4

2. Unit 4 Global warming

4. We depend on energy to do many things in our daily life
We depend on energy to do many things in our daily life. Make a list of the things that consume energy. Where does all this energy come from?

5. windmills
a coal power station

6. an oil refinery
a nuclear power plant

7. hydro-electric dam
solar panels

8. An energy source is “renewable” when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable?

9. Renewable / non-renewable
Sample lists
Things that use energy
Sources of energy
Renewable / non-renewable
light
coal
non-renewable
heating
oil
non-renewable

10. non-renewable
television
natural gas
cassette player
wind (wind power)
renewable
video recorder
sun (solar energy)
renewable
uranium (nuclear energy)
non-renewable
computer

11. water (hydro-electric) fridge renewable
plant waste (biomass energy)
stove
renewable
hot springs or geysers (geothermal energy)
washing machine
renewable
the sea (tidal energy)
hairdryer
renewable

12. Renewable or non-renewable?

13. Renewable or non-renewable?

14. What is told in the picture?

15. 1. Do you think the climate is becoming warmer and warmer every year
1. Do you think the climate is becoming warmer and warmer every year? State your feelings to your partners.
2. Do you think the earth is becoming warmer because of human activities?

16. 3. Have you ever seen a greenhouse
3. Have you ever seen a greenhouse? What is the greenhouse made and used for?

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

18. 4. 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.

19. 5. 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.

20. 6. What do you think greenhouse
gases do?
They trap the heat of the sun and keep the air surrounding the earth warm.
7. How do you understand “greenhouse effects”?

21. Main idea of each part
Writing techniques
(Paragraph 1)
Introduce a debate over the issue of global warming.
Raising a question

22. Main idea of each part
Writing techniques
(Paragraphs 2– 3)
Giving examples, using graphs, explanation.
Illustrate how global warming comes about.

23. Main idea of each part
Writing techniques
(Paragraphs 4– 5)
List two different attitudes among scientists towards global warming.
Giving examples, making contrast.

24. Main idea of each part
Writing techniques
(Paragraph 6)
It’s up to readers to think and decide whether people should do something about global warming or not.
Using a question, leaving readers to think over the issue.

25. Glance quickly at the magazine article and answer the questions.
1. Who wrote the magazine article?
What is the name of the magazine?
Sophie Armstrong wrote the magazine
article. The name of the magazine is
Earth Care.

26. 2. What are the names of the three
scientists mentioned in the article?
They are Dr. Janice Foster,
Charles Keeling and George
Hambley.

27. 3. What do they think about global
warming? Do they agree with one
another?
There are some very different attitudes
among scientists towards this issue.
Some think the effects will be terrible,
while some others believe that we
should not worry about it.

28. 4. What are the two graphs about?
Graph I shows the temperature increase of one degree Fahrenheit between 1860 to 2000.

29. Graph 2 shows the carbon dioxide content in the atmosphere from 1957 to 1997.

30. 5. What is the main topic of the
article?
Global warming/ the warming of
the earth.

32. Read the text carefully and fill in the blanks.
Scientists
Opinion
Janice Foster
We need ______ like carbon dioxide, methane and water vapour, but if we add huge ___________ extra carbon dioxide to the atmosphere by burning fossil fuels, it will cause the __________________ to go up.
gases
quantities of
global temperature

33. Scientists
Opinion
Janice Foster
Over the next 100 years the amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees Celsius.
An increase of five degrees would be a ___________.
catastrophe

34. Scientists
Opinions
George Hambley
Believes that we shouldn’t worry about __________ of carbon dioxide in the air.
Predicts that any warming will be mild with few bad environmental ____________.
______ that more carbon dioxide is actually a ________ thing, which will make life for human beings better.
high levels 　
consequences
States
positive

35. True or False
1. The temperature in the last century
did not seem to increase much.
2. Everyone believes that global warming
is caused by the activities of humans.
3. Janice Foster believes that she can
measure the future global rise in
temperature.

36. 4. The rise in carbon dioxide is causing a
steady increase in global warming.
5. George Hambley believes that global
warming will do good rather than
harm to the earth.
6. It is clear what the effects of global
warming will be.

37. F F O F Decide which are opinions (O) and which are facts (F).
( ) 1. Coal, natural gas and oil are fossil fuels.
( ) 2. The “greenhouse effect” is a natural phenomenon.
( ) 3. The “greenhouse effect” makes our life worse.
( ) 4. The amount of carbon dioxide increased from about 315 parts to about 370 parts per million from 1957 to 1997. F F O F

38. ( ) 5. Global warming will have a serious effect on human beings.
( ) 6. It is not necessary to worry too much about the high level of carbon dioxide.
( ) 7. More carbon dioxide will help produce more crops.
( ) 8. The earth's climate will continue to become warmer. O O O O

39. Describe the process of the rising of the earth's temperature because of the “greenhouse effect”.

40. We should do nothing about
the global warming.

41. Instructions
Get into groups of six. Decide which
three in your group are going to
agree with the statement (Group A)
and which three are going to disagree
with the statement (Group B).

42. Group A discuss why they agree
with the statement; Group B
discuss why they disagree.
Group A and B get together. Tell
each other the reasons for agreeing
or disagreeing with the statement.

43. Supplementary materials
for debating
Global warming
1. The planet has warmed anywhere
from 0.5 to 1.0℃ (1 to 2℉) over
the last century.

44. This small amount makes a huge difference, causing glaciers to melt and, potentially (潜在的), sea level to rise. We could see even more of this in the future, (maybe another 3℃, or 5℉)

45. 2. A definition of global warming would have to include a measurable, consistent temperature rise, like the one we have seen in recent history. A question remains – Is it an unusual change? Much debate about that one.

46. 3. The earth gets one kind of energy (visible light) from the sun and gives off another kind (infrared红外线). This kind is what gets trapped by “greenhouse gases” (GHG’s) in the atmosphere.

47. Green house gases
4. The global warming green house effect really is a bogus (假的) term. A greenhouse keeps warm by physically trapping the air inside and preventing convection (对流). The atmosphere helps keep the planet warm by trapping outgoing radiation instead.

48. 5. The leading gasses are Carbon-dioxide, Methane, Ozone (臭氧) and Nitrous Oxide (一氧化二氮). Gas analyzers show the concentrations of this stuff have increased somewhat since the beginning of the industrial revolution.

49. 6. The greenhouse effect raises the
average temperature of the Earth by
more than 30 degrees, so without it the
Earth would be a very cold place!
green house effect

51. Read the passage again and review
the new words and expressions.