高中英语选修六unit4-reading.ppt

Unit Global Warming
Reading
lead in
Can you think of some natural disasters
(自然灾害) because of the extreme heat(酷 暑)?
drought(旱灾)
fire
Reading
The Earth is Becoming Warmer --But Does It Matter? 地球在变暖—— 要不要紧？
2. There is no doubt that global warming is caused by the human activities.
3. Not all scientists believe that the increase in the earth’s temperature is due to the burning of fossil fuels.
Carbon dioxide
Homework
1.Read the text again, and try to retell it.
2.Find out the difficult sentences in
the passage .
• It is everyone’s duty to make a contribution to our
What do the scientists think about global warming? Do they agree with one another?
They have quite different attitudes towards this issue.
Dr.Foster:_I_t_w_o_u_ld__be__a_c_a_ta_s_tr_o_p_he_.__ George Hambley:_w_e__sh_o_u_ld_n_o_t_w_o_rr_y_a_b_out it.
2. Greenhouse gases
The problem begins when huge quantities of extra carbon dioxide (大量的二氧化碳) are added into the atmosphere.
Fossil Fuel(矿物 燃料)
coal
produce
They trap the heat from the
Methane['mi:θein]
sun and warm the
earth.
Carbon dioxide
Water vapour
Para 4. the levels of carbon dioxide have increased greatly over the last 100 to 150 years
environment.
6. We know the effects of global warming.
Paragraph 2&3
How has global warming come about(产生)?
1. Human activity …is due to the burning of fossil fuels…
1. make plants grow quicker
2. crops will produce more
3. a greater range of animals
4. make life better
Summary
How
Effects
1. Human activities
2.Greenhouse gases
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.
diseases 7. disappearance of
species
Positive effects
The sea level to rise.
Severe storms
droughts
famines
the spread of diseases
disappearance of species
Paragraph 6
Part4
Should we do anything? The earth is becoming warmer.
Paragraph 7
True or false
1. During the 20th century, the temperature of the earth didn’t seem to increase much.
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 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 atmosphere 大气 methane 甲烷， 沼气
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
4. The levels of carbon dioxide have increased greatly over the last 100— 150 years.
5. George Hambley believes that global warming will do good to the earth.
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.
Paragraph 6
Who ：__S_o_ph_ie__Ar_m_s_tr_o_ng_
Three scientists:
_D_r J_an_ic_e_F_os_te_r;_____
Charles
George
_Ke_e_lin_g_; ____H_a_m_ble_y_;
What are the two graphs about?
accurate measurements 精确 的测量
data 资料，数据 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
Scanning
Does global warming matter?
Negative effects (负面影响）
Positive effects （正面影响）
Negative effects
1. cause the sea level to rise
2. severe storms 3. floods 4. droughts 5. famines 6. the spread of
Main idea of the text
Part1
Paragraph 1
How global warming comes about? (全球变暖是怎样产生的)
Part2
Paragraphs 2&5
Two different opinions about global warming.
Part3
Graph 1 shows the temperature difference (温度差 异) from 1860 to 2000.
Graph 1:
Graph 2:
Graph 2 shows the carbon dioxide content(二 氧化碳含量) in the atmosphere from 1957 to 1997.
oil
gas
carbon dioxide
二氧化碳
● ● ● ● ● ● global warming
Have you ever seen a greenhouse?
What are Greenhouse gases?
There are gases called “greenhouse gases”, including…