Unit 3 Environmental Protection Reading and Thinking 1 课件（31张）人教版（2019）选择性必修 第三册

(共31张PPT)
Unit 3 Environmental Protection
Lesson 1 Reading and Thinking
What can you see in the picture
Glaciers are melting
What might happen if the glaciers continue to melt
What leads to the melting of glaciers
Ice is breaking off from glaciers.
Global warming.
in the Artic and Antarctica.
I. Lead-in
a tsunami
a rise in sea level
I. Lead-in
What might happen if the glaciers continue to melt
loss of wildlife habitat
What other consequences might the global warming bring about
I. Lead-in
more frequent wildfires
longer periods of drought and heat waves in some regions
an increase in the number and intensity(强度) of tropical storms
Earth provides enough to satify every man's needs, but not every man's greed.
——Mohandas K. Gandhi
I. Lead-in
In this unit, you will:
read about different environmental problems.
listen to an interview with an expert and talk about air pollution.
write a report on an environmental issue.
learn more about environmental issues and ways to protect our planet.
Learning objectives
Lesson 1
Reading and Thinking
Learning objectives
In this lesson, you will:
1. learn about global warming and its causes, effects and solutions;
2. use mind map to analyze the main idea, structure and language features of an cause-effect expository essay;
3. think about what might help deal with the problem of global warming, and provide possible solutions.
What might the passage be about
II. Pre-reading
The graph shows us that the global surface temperature is rising continuously and dramatically in recent decades.
What information can you get from the graph
II. Pre-reading
What might cause the death of the polar bear
The polar bear looks skinny, and might die of disease or a lack of food.
II. Pre-reading
How would the pictures below be related to the topic of the passage
II. Pre-reading
Read for the main idea of each paragraph
III. While-reading
Para 1: the evidences of dramatic global climate change
Read for the main ideas
Para 2: a case of global warming and its impact on Earth’s ecology
Read for the main ideas
Para 3: the cause of global warming——
the man-made greenhouse effect
Read for the main ideas
Para 4: the effects of the rise in temperature
Read for the main ideas
Para 5: the solutions to reducing greenhouse gas emissions
Read for the main ideas
Para 1: the evidences of dramatic global climate change
Para 2: a case of global warming and its impact on Earth’s ecology
Para 3: the cause of global warming——the man-made greenhouse effect
Para 4: the effects of the rise in temperature
Para 5: the solutions to reducing greenhouse gas emissions
Read for the main ideas
III. While-reading
The phenomena/evidence of dramatic global climate change
The causes of the increase in the global average surface temperature
The effects/consequences of the rise in temperature
The solutions to reducing greenhouse gas emissions
Read for the main ideas
expository
Extend the mind map based on the passage to show the following aspects of global warming:
Global warming
phenomena
causes
effects
solutions
Global warming
causes
phenomena
continued greenhouse gas emissions by burning fossil fuels.
a rise in temperature;
a warming ocean and atmosphere;
melting ice and rising sea levels;
the starved polar animals.
effects
solutions
“man-made” greenhouse effect
an increase in extreme weather and natural disasters;
deaths and economic losses;
loss of habitat and wildlife extinction.
individuals
restrict the amount of carbon dioxide our lifestyles produce;
educate the public.
governments
make policies;
take measures to reduce emissions.
Read for details & language features
How has climate change influenced the polar bear’s life
Read Para1-2 and answer the questions:
The bear could not hunt on ice.
Low sea-ice levels in the arctic circle.
It was starved to death.
It had to travel longer distances to find food.
Climate change.
Its dead body found.
1
2
3
4
5
6
Read for details
“skin and bones”
How has climate change influenced the polar bear’s life
Read Para1-2 and answer the questions:
Climate change.
Low sea-ice levels in the arctic circle.
The bear could not hunt on ice.
It had to travel greater distances to find food.
It was starved to death.
Its dead body found.
Read for details
“skin and bones”
What is greenhouse effect
Read for details
Read Para3 and answer the question:
A
B
C
D
A. Heat enters the atmosphere.
D. Heat is trapped by green-house gases.
B. Heat warms the earth’ surface as short-wave radiation.
C. Heat is released back into space at longer wave lengths
Atmosphere
Earth
Why did the author mention the climate scientists’ warning
Because the writer wants to warn us of the urgency of taking appropriate actions to tackle the issue of global warming.
Read for language features
Read Para4 and answer the question:
What writing techniques are used in this expository essay
Read for language features
Examples and a case study as evidence;
Explanations of scientific concepts
Quotations from experts in the field;
Statistics from scientific researches.
Read Para4 and answer the question:
What should we do in daily life to reduce “carbon footprint”
Extend your mind map and share in class.
e.g.
avoid driving cars;
use public transportation;
reduce waste;
recycle;
……
IV. Post-reading
summarize the main idea of each paragraph by using reading strategy;analyze the structure of an expository essay by drawing mind map;summarize the writing techniques in an expository essay;discuss some possible solutions for reducing carbon footprint.SummaryDo more research on global warming, e.g. how to reduce carbon footprint, and extend your mind map by adding more details for each part.Climate changeV. Assignment