Unit 3 Environmental Protection 课件(共48张PPT，内嵌视频)-2025-2026学年人教版（2019）选择性必修第三册

(共48张PPT)
UNIT 3
Earth provides enough to satisfy every man’s needs, but not every man’s greed.
— Mohandas K. Gandhi
Environmental Protection
1. What can you see in the picture
2. What is the cause of this phenomenon
melting glacier
地球能满足人类的需要，但满足不了人类的贪婪。
Earth provides enough to satisfy every man’s needs, but not every man’s greed.
Global warming
What’s happening in the video
1. What can you see in the picture
2. What is the cause of this phenomenon
melting glacier
地球能满足人类的需要，但满足不了人类的贪婪。
Earth provides enough to satisfy every man’s needs, but not every man’s greed.
Global warming
drought[dra t]
flood[fl d]
Storm（st m）
sea level rise
heat wave
fire
Global warming
Climate change
What do you think causes such extreme weather and disasters
What extreme weather and disasters do you know
What is “Global Warming”
Global warming
Reading and thinking
Climate Change Requires The World’s Attention
What is the graph about What information can you get from it
What’s the author’s purpose of using the graph and the photo
Pre-reading
The graph shows the change in the Global Surface Temperature between 1920 and 2016.
The Global Surface temperature is abnormal and rising.
Temperature Anomaly（气温反常现象）
What information can we get from the graph
There is no doubt that the Earth is getting warmer and warmer.
Then something bad has happened
......
The polar bear (北极熊) was skin and bones（瘦得皮包骨） and starved to death.
Look and discuss
1. What's the type of this text
A. Travel journal B. Biography C. Exposition. D. Argumentation.
2. What's its purpose
To inform readers to deal with climate change
To persuade readers to focus on limited resources
To tell readers some polar bears are dying of starvation.
To tell readers what the greenhouse effect is.
3. In which part of a newspaper or magazine may we find this passage
A. Entertainment B. Economy C. Education D. Environment
本文是一篇说明文。说明文是客观说明事物的一种文体，以解说或介绍事物的形状、性质、成因、构造、功用、类别等为主要内容。说明文主要通过对客观事物或事理的介绍说明，达到以知识教人的目的，因此说明文以客观、准确为基本要求，强调科学性和客观性。
Skimming
While-reading: read for the structure and main idea
Part 1:
(para.1-2 )
Part 2:
(para. 3)
Part 3:
(para. 4)
Part 4:
(para. 5)
The evidence of dramatic climate change that had an impact on Earth’s ecology
The causes of the increase in the global average surface temperature
The consequences of the rise in temperature
The solutions to reducing greenhouse gas emissions
Match the main idea with each part.
Find out the topic sentence of each paragraph.
Paras.1&2
Para.3
Para.4
Para.5
problem
Paras.1&2
Para.3
Para.4
Para.5
cause
consequence
solutions
Read for structure.
1. What is the problem about climate change
2. What happened to the polar bear in the photo Why did the writer write about it
3. What is the cause of the increase in the global average surface temperature
4. What is the function of the “natural” greenhouse effect Why has the “man-made” greenhouse effect become a big problem now
5. What are the consequences of the global temperature rise
6. What can be done to solve the global warming
1. What is the problem about climate change
Para 1
The Earth is getting warmer and warmer.
Evidence 3: ___________________
melting ice
rising sea levels
climate
change
Evidence 1: _______________
a warming ocean and atmosphere
Evidence 2: ______________
Read for details.
Para 2
瘦骨嶙峋
2. An example of climate change
The news photo of a dead polar bear was taken in Norway’s Arctic of Svalbard in 2013.
The polar bear was “ skin and bones”.
Read for details.
climate change
starvation
longer
food-seeking travel
lack of food
low sea-ice level
The following reasons account for 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: An example of climate change
Para 3
3. What is the cause of the increase in the global average surface temperature
Read for details.
__________ greenhouse effect
_________ greenhouse effect
causing Earth’s surface temperature ______________ if too much heat energy is _______
keeping Earth’s climate _______ and __________
natural
man-made
warm
habitable
to rise quickly
trapped
Greenhouse Effect
Function
A big problem
4. What is the function of the “natural” greenhouse effect Why has the “man-made” greenhouse effect become a big problem now
How does greenhouse effect work
Heat released back into space
Heat reflected back to Earth’s surface
Reflected sunlight
Atmosphere
Sunlight
Draw a diagram
Diagrams are very useful tools that can be used to brainstorm ideas, map out processes, show cause and effect relationships, explain a new idea or concept, and so on. When you read an essay about scientific issues, you can try drawing a diagram, which will not only allow you to visualise the problems more clearly but also can help demonstrate your creative thinking and problem-solving.
Read paragraph 3 and create a diagram describing how the greenhouse effect works.
The rise in temperature
extreme weather natural disasters
serious damage,
costing human lives, economic losses
leads to
examples
results
Read for details.
Para 4
extreme rainstorms, heat waves
5. What are the consequences of the global temperature rise
6. What can be done to solve the global warming
Para 5
solutions
governments
make policies
take appropriate actions and measures
individuals
reduce our “carbon footprint” by…
educate everyone about global warming
Read for details.
solutions
Mind-map
problem
example
reasons
influences
solutions
phenomenon
cause
effect
solution
Expository writing
本文按照“证据—原因—危害—措施”的逻辑顺序展开，环环相扣，步步深入。标题Climate Change Requires the World’s Attention点明了作者的诉求：气候变化对地球生态系统的影响是巨大的，需要全人类共同关注和面对。文本以现在时态和将来时态为主，强调文章的现实意义及对将来不利后果的预测。
The development of the passage.
As a student, what can we do to reduce our “carbon footprint”
Group discussion
What is “carbon footprint”
1. Turn off the light, switch, pull the plug if don’t use.
2. Walk or cycle to school.
3. Recycle cans, bottles, plastic bags and so on.
4. Buy things made from recycled materials.
5. Plant more trees.
6. Talk with family and friends about global warming.
......
Group discussion
Turn off the lights, computers etc. the moment you don’t need them.
Sort out the garbage
Use renewable energies
Stop using plastic bags
Use the minimum paper
Take green transportation
Take a shower instead of a bath
plant more trees
Take the stairs instead of elevator
Earth provides enough to satisfy every man’s needs, but not every man’s greed.
— Mohandas K. Gandhi
地球能满足每个人的需要，但不能满足每个人的贪婪。
We should cherish what we have and do whatever we can to make the world a better place, leaving the green mountains and blue waters for our offsprings.
　　As we know, Earth is getting warmer and warmer, (1)______ results in melting ice and rising sea levels. In 2013, a dead polar bear (2) _________(find) on Norway’s Arctic island of Svalbard. Experts said that it was low sea-ice levels (3)______(cause) by climate change(4)____ killed the polar bear. Scientists often mention that the “man-made” greenhouse effect is a big problem. (5)____ rise in temperature has led to an increase in extreme weather and natural disasters worldwide,(6)_______(cause) serious damage and costing human lives. The further global warming resulted(7)_____the continued greenhouse gas emissions(8)________(require) the attention of people all over the world. Governments need to make policies and take measures (9) ________(reduce) greenhouse gas emissions. As individuals, we should also reduce our “carbon footprint” by restricting the amount of carbon dioxide our (10)________(lifestyle) produce.
which
was found
caused
that
The
causing
from
requires
to reduce
lifestyles
Summary
　　As we know, Earth is getting warmer and warmer, which results in a warm ocean and atmosphere,(1) and rising sea levels.(para.1) In 2013, a(2) was found on Norway’s Arctic island of Svalbard. Experts said that it was low sea-ice levels (3)______(cause) by climate change that killed the polar bear.(para.2) Scientists often mention that the “man-made” greenhouse effect is(4) . (para.3) The rise in temperature has led to an increase in(5) and natural disasters worldwide,(6)_______(cause) serious damage and costing human lives.(para.4) The continued greenhouse gas emissions will result in further global warming , which (7)________(require) the attention of people all over the world. Governments need to (8) and take measures to reduce greenhouse gas emissions. As individuals, we should also reduce our
(9) by restricting the amount of carbon dioxide our lifestyles produce. (para.5)
caused
causing
melting ice
dead polar bear
extreme weather
a big problem
requires
make policies
“carbon footprint”
Post-reading
Period 2 Language points
Reading and Thinking
CLIMATE CHANGE REQUIRES THE WORLD'S ATTENTION
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.
了解
气候变化需要全世界的关注
关注
气候变化
几十年来
毫无疑问
海洋
大气层
和
融化的
海平面上升
证据
急剧的
1. There is little doubt that Earth is getting warmer and warmer.
There is little doubt... 几乎没有疑问的是……
There is no doubt that... 毫无疑问的是……
There is some doubt about sth. 对……值得怀疑
that引导同位语从句，解释说明doubt的具体内容
注意：doubt前有否定意义的词修饰时，其后的同位语从句由that引导；doubt前有肯定意义的词修饰时，其后的同位语从句由whether或if引导。
2. A warming ocean and atmosphere along with melting ice and rising sea levels provide evidence of a dramatic change in the global climate. (P26)
句式分析
along with 连接前后两个主语时，谓语动词应和________那个主语保持一致，即“就远原则”。
前面的
海洋和大气变暖，以及冰层融化、海平面上升，都为全球气候急剧变化提供了依据。
1. A library with five thousand books _________ (offer) to the nation as a gift.
2. All but one _____ (be) here just now.
3. WeChat, as well as Ding Talk, __________ (play) an important part in daily communication nowadays.
is offered
were
is playing
即学即用
In 2013, a lot of people were shocked by a news photo of a dead polar bear that was found on Norway's Arctic island of Svalbard. According to the scientists who found its dead body, all that remained of the polar bear was “skin and bones". An expert who has studied polar bears for many years said that from the position of its dead body, the bear appeared to have starved and died. Experts claimed that low sea-ice levels caused by climate change meant the bear could not hunt seals as before, so it had to travel greater distances in order to find food. This alarming case showed how the increase in temperature had an impact on Earth's ecology.
对...感到震惊
+定从
挪威的北极圈斯瓦尔巴群岛
根据
+定从
+定从
剩下
皮包骨
+定从
专家
+宾从
位置
好像
挨饿
声称
+宾从
海冰面降低
意味着
海豹
像从前一样
长途跋涉
为了
令人震惊的案例
+宾从
对...有影响
生态
3. According to the scientists who found its dead body, all that remained of the polar bear was “skin and bones”.
who引导的定语从句，修饰先行词scientists
that引导的定语从句，修饰先行词all, that不能用which代替
句意：根据发现北极熊尸体的科学家的说法，这只北极熊只剩下了“皮和骨头”。
【2018-北京】5. She and her family bicycle to work, _________ helps them keep fit.
【2018-天津】2. Kae, ________ sister I shared a room with when we were at college, has gone to work in Australia.
【2018-江苏】23. Self-driving is an area ________ China and the rest of the world are on the same starting line.
【2017·北京卷】31. The little problems ________ we meet in our daily lives may be inspirations for great inventions.
【2017·江苏】28. In 1963 the UN set up the World Food Programme, one of _________ purposes is to relieve worldwide starvation.
which
whose
where
whose
that
Then what is causing the increase in the global average surface temperature Climate scientists often mention a key climate process called the “greenhouse effect", which has two common meanings: the "natural" greenhouse effect and the “man-made" greenhouse effect. The “natural”greenhouse effect refers to the fact that heat from the sun enters the atmosphere and warms Earth's surface as short-wave radiation. The heat is released back into space at longer wave lengths.
全球平均表面气温
提及
关键的气候过程
温室效应
+非定从
常见的含义
天然的
人造的
v.使变暖
+同位语从句
热量
大气层
指的是
表面
以短波辐射的形式
be released into...
被释放到...
以更大的波长
Greenhouse gases in the atmosphere, such as methane and carbon dioxide, trap some of the heat, keeping Earth's climate warm and habitable. Without this process, Earth could not sustain life. However, the “man-made" greenhouse effect has now become a big problem. When people produce huge amounts of extra greenhouse gases by burning fossil fuels, more heat energy is trapped in the atmosphere and causes Earth's surface temperature to rise quickly.
温室气体
甲烷
CO2
v.留住
适合居住的
维持
+时间状从
产生
大量的
额外
by doing sth.通过做某事
燃烧化学燃料
热能
被困在...
上升
导致
4. The “natural” greenhouse effect refers to the fact _____ heat from the sun enters the atmosphere and warms Earth’s surface as short-wave radiation.
that
同位语从句：大多由从属连词_____引导,常常跟在order, report, wish, decision, suggestion, belief, doubt, fact, hope, message, news等抽象名词的____，一般用来解释或说明这些名词的具体含义或内容。
that
后面
即学即用
1. They expressed the hope _______ they would come over to China soon.
2. Word has come _______ some American guests will come to our college for a visit next week.
3. He can’t answer the question _______ he got the money from his home yesterday.
4. Do you have any idea _______ is actually going on in the classroom
5. The problem ________ we should have the meeting in the hall now must be decided at once.
that
that
how
what
whether
5. Greenhouse gases in the atmosphere, such as methane and carbon dioxide, trap some of the heat, keeping Earth’s climate warm and habitable. (P27)
大气层中甲烷、二氧化碳等温室气体吸收了部分热量，从而使地球保持气候温暖、适宜居住。(P27)
句式分析
v-ing 短语在句子中作__________。
结果状语
1. European football is played in more than 80 countries, ________ (make) it one of the most popular games in the world.
2. Their car was caught in a traffic jam, thus ________ (cause) the delay.
3. Her husband died ten years ago, _______ (leave) her with three children to look after.
3. ___________ (consider) the reasons mentioned above, we should take effective measures to protect our environment.
4. The leader stayed up all night, _________ (think) of what to do the next day.
5. __________________ (not receive) her reply, he decided to send another e-mail to her.
leaving
making
causing
Considering
thinking
Not having received
There is strong and comprehensive evidence that the rise in temperature has led to an increase in extreme weather and natural disasters worldwide, not only causing serious damage, but also costing human lives. Climate scientists have warned that if we do not take appropriate actions, this warming trend will probably continue and there will be a higher price to pay. In fact, news reports are frequently broadcast about extreme rainstorms and heatwaves causing deaths and economic losses.
全面的
证据
+同位语从句
导致
极端天气
自然灾害
严重破坏
使人类丧命
+宾从
+条件状从
采取适当行动
趋势
付出更高的代价
频繁报道
暴风雨
热浪
经济损失
Continued greenhouse gas emissions will result in further warming and long-lasting changes to the global climate. This requires the attention of people all over the world. Governments need to consider making policies and taking appropriate actions and measures to reduce greenhouse gas emissions. We as individuals can also reduce our “carbon footprint” by restricting the amount of carbon dioxide our lifestyles produce. It is our responsibility to seize every opportunity to educate everyone about global warming, along with its causes and impacts, because this is the most serious issue affecting all of us on this planet. So what will you do to help
持续的
排放
导致
进一步的
持续的
需要...的关注
全世界
政府
考虑
制定方针
采取行动和措施
减少温室气体排放
作为个人
碳足迹
省略that的定从
限制
...的数量
我们有责任去做某事
抓住机会做某事
教育
和
+原因状从
严重问题
影响