选修6unit4公开课

Homework
Para 4. the levels of carbon dioxide have
increased greatly over the last 100 to 150 years 1. Who made accurate measurements of the amount of carbon dioxide? Charles Keeling 2. How much has increased?
The carbon dioxide in the atmosphere went up from around 315 parts to around 370 parts per million.
Para 5. How high will the temperature go?
The amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees.
பைடு நூலகம்
Positive effects
Negative effects
1. cause the sea level to rise 2. severe storms 3. floods 4. droughts 5. famines 6. the spread of diseases 7. disappearance of species
Positive effects
1. make plants grow quicker 2. crops will produce more 3. a greater range of animals 4. make life better
Disscussion: How to reduce greenhouse gases?
III (4-6)
Careful reading : the first paragraph:
Who wrote the article? Sophie Armstrong What is the name of the magazine?
Earth Care
Part
II(Para2-3)
1. Everyone believes that global warming is caused by the activities of humans. T 2. Janice Foster believes that she can measure the future global rise in temperature. F 3. Greenhouse Gases are totally bad.
F
Fill in the blanks about the causes of Greenhouse effect. 1. Greenhouse effect is a natural p_______. henomenon Small amounts of Greenhouse gases in ______ the atmosphere. But the problem begins when we add huge q uantities of extra carbon dioxide to the atmosphere. Therefore, more heat energy is t rapped in the atmosphere causing the global go up temperature to _________.
Para 6
What do Dr. Janice Foster and the scientist George Hambley think about the consequences of global warming? Dr. Janice Foster thinks it is serious. George Hambley thinks global warming will be mild with few bad environmental consequences. Do they agree with one another?
atmosphere 大气
methane 甲烷， 沼气
Skimming
Skim the title: THE EARTH IS BECOMING WARMER – BUT DOES IT MATTER?
What is the main topic?
A.The earth.
B. Global warming.
They don't agree with each other.
Does global warming matter?
Negative effects Positive effects
Negative effects
1. cause the sea level to rise 2. severe storms 3. floods 4. droughts 5. famines 6. the spread of diseases 7. disappearance of species
phenomenon 现象
subscribe to 同意，赞成 fossil fuels 矿物燃料 byproduct 副产品 “greenhouse” gases 温室气体
catastrophe 大灾难
be opposed to 反对 environmental consequences 环境影响 a great range of 大量的 even if 即使 keep on 继续
Have a disscussion with your classmates .
The earth is becoming warmer, does it matter?
1.Read the text again, and try to retell it. 2.Find out the difficult sentences in the passage .
II
Conclusion
IV
Para. 2-3 Para. 7
III
Para. 4-6
Match the main idea of each part:
II (2-3) I (1) IV (7)
• Explain how global warming comes about. • Introduce the problem of global warming. • Give a warning and raise a question for the readers to think over. • Two different attitudes among scientists towards the consequences of global warming.
C. Becoming warmer doesn’t matter.
The structure of the article: A title
Introduction
Body
Conclusion
Skim the body part(7 paras):
Introduction
Para. 1
I
Body
Unit 4 Global Warming
Reading
The Earth is Becoming Warmer --But Does It Matter? 地球在变暖—— 要不要紧？
New Words and expressions
temperature 温度 degree Celsius 摄氏度 one degree Fahrenheit 华氏一度 quantities of 大量的 explore 探索 human activities 人类活动 accurate measurements 精确 的测量 data 资料，数据