人教课标 高二 选修 6 Unit 4

Unit 4 Global warming

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?

windmills a coal power station

an oil refinery a nuclear power plant

hydro-electric dam solar panels

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?

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

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

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

Renewable or non-renewable?

Renewable or non-renewable?

What is told in the picture?

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?

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

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

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.

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.

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”?

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

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

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

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.

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.

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

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.

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

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

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

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

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

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

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.

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.

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

( ) 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

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

We should do nothing about the global warming.

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).

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.

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.

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℉)

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.

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.

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.

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.

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

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