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(共21张PPT)
高二下学期 人教版（2019）选择性必修三
Unit 3 Environmental Protection
Reading and Thinking
——discuss climate change
unit3 Climate Change Requires the World’s Attention
Teaching aims:
to master the structure of this passage.
to know the cause and effect between greenhouse effect and global warming
to call on students to live a low-carbon life and care for wild animals.
因果关系
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Intersing qustions:
where do they live
in the Arctic
in the North pole
what color is the skin
what corlor is its fur
Favorite food:
seals ; fish; seabirds; Arctic fox and so on
I am black.
My fur is transparent!
透明的，阳光折射成白色
`lovely polar bears
√
According to World Conservation Union(世界自然保护联盟),there are only 25,000 polar bears left.
so we should save them.
What’s the gragh about
What information can you get from it
The temperature is on the r_____.
rise
Match the main idea with each paragraph
Para 1.
Para 2.
Para 3.
Para 4.
para 5.
a global climate change
the causes of global warming
an alarming case
solutions
Fast-reading:Focus on the structure
the effects of global warming
Global warming
a polar bear died
A tip:pay attention to the first and last sentence of each paragraph.
What evidence of climate change can you find in the 1st paragraph
3 pieces of evidence of global warming:
①__________________________②____________
③_______________
a warming ocean and atmosphere
melting ice
rising sea level
We have known about climate change for decades. There is little doubt that Earth is getting warmer and warmer (see the graph). A warming ocean and atmosphere along with melting ice and rising sea levels provide evidence of a dramatic change in the global climate.
Para 1 Problem
Polar bears also lost their habitat due to _____________
the melting ice.
Polar bears fall victim to global warming
Para2 :The alarming case
1. Why was a polar bear referred to in the second paragraph __________
A.To introduce the the polar bears.
B.To explain the reason.
C.To show the dangerous situation of polar bears.
D.To show the effect of the global warming.
D
look at the last sentense:
A tip: the purpose is to introduce the topic.
Not to tell us a fact or a story.
cliCLC
climate change
starvation
longer
food-seeking travel
lack of food
low sea-ice level
The following reasons explain the death of the polar bear, with one influencing another.
Read paragraph 2 and put them in a correct logical order.
What is the root cause
Para 2 The alarming case
Para 3 Causes of global warming
natural
man-made
warm
habitable
to rise quickly
good,helpful
bad, harmful
2.What's the main reason for the global climate change ____________
A.The “man-made”greenhouse effect.
B.The natural greenhouse effect.
C.Methane and carbon dioxide.
D.The short-wave radiation.
A
Para3: Causes of global warming
There are other greenhouse gases.
Which countries do you think contribute more to global warming: developed counties like America or undeveloped coutries in Africa why
Further Thinking:
The answer is developed cuntries
because they released much more carban dioxside to the earth’s atmosphere
Man-made greenhouse effect
Para 4 Effects of global warming
Q1. What are the consequences of the global temperature rise
The rise in the temperature
extreme weather & natural disasters
lead to
results
examples
____________, ________________
________________ ________________
serious damage
costing human lives,
extreme rainstorms,
heatwaves
Para4: Effects of global warming
3. What's the main idea of the 4th paragraph _______
A.The increasing extreme weather.
B.The consequences of the rise in the tempreature.
C.The warming trend will last for a long time.
D.People will pay a high price.
B
extreme weather and even human lives
Para5 Solutions
1. make __________
2. take __________________________
1. restrict __________________________ our lifestyles produce
2. seize every opportunity to _______________________________
policies
educate everyone about global warming
appropriate actions and measures
the amount of carbon dioxide
Post-reading:
4.What’s the purpose of the text __________
A.The long-lasting changes to the global climate.
B.The decreasing number of polar bears.
C.call on People all over the world to pay attention to the climate change.
D.The“greenhouse effect” has become a big problem.
C
The answer is in the ___________paragragh.
last
The structure of the passage:
Para 1.
Para 2.
Para 3.
Para 4.
para 5.
global warming
the causes of global warming
an alarming case
solutions
the effects of global warming
Make a summary
show the problem
analyse the problem
solve the problem
The cause and effect
meatures
As a student, what can we do to live a low-carbon life
Group discussion
Free-talk
1. recycle bottles/paper/plastic bags
2. forest protection
3. cycle to school
4. plant more trees
5. turn off the lights and fans when leaving
6. call on the fellows to take actions
It’s our responsibility to live a low-carbon life and care for wild animals.
Homework: write a composition:
As a student, what can we do to live a low-carbon life

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