资源简介

(共25张PPT)
Section Ⅰ　Reading and Thinking—Comprehending
UNIT 3 ENVIRONMENTAL
PROTECTION
难词注解
①starve vi.& vt. (使)挨饿；饿死
②ecology n. 生态；生态学
③release vt.& n. 排放；释放；发布
④carbon n. 碳carbon dioxide 二氧化碳
⑤sustain vt. 维持；遭受；承受住
⑥ fuel n. 燃料；刺激性言行fossil fuel 化石燃料(如煤或石油)
难词注解
⑦comprehensive adj. 全部的；所有的；详尽的
⑧ trend n. 趋势；趋向；动向
⑨frequently adv. 频繁地；经常
⑩broadcast vt. & vi. 播送；广播；传播
policy n. 政策；方针；原则
restrict vt. 限制；限定；束缚
seize vt. 抓住；夺取；控制
教材原文
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). 1 A warming ocean and atmosphere along with melting ice and rising sea levels provide evidence of a dramatic change in the global climate.
1“There is little doubt that...”意为“毫无疑问……”，that 引导同位语从句。
教材原文
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”．2 An expert who has studied polar bears for many years said that from the position of its dead body, the bear appeared to have starved① 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
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order to find food. 3 This alarming case showed how the increase in
temperature had an impact on Earth's ecology②.
2 句中who 引导定语从句，修饰the scientists; that 引导定语从句，修饰all, all that 相当于what。
3 句中that 引导宾语从句， 其中meant后又跟一个省略that 的宾语从句。
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
教材原文
effect and the“man-made” greenhouse effect.4 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. 5 The heat is released③ back into space at longer wave lengths. Greenhouse gases in the atmosphere, such as methane and carbon④ dioxide，trap some of the heat, keeping Earth's climate warm and habitable. Without this process，Earth could not sustain⑤life. However, the“man-made”greenhouse effect has now become a big problem. When people produce huge amounts of extra greenhouse gases by burning fossil
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fuels⑥， more heat energy is trapped in the atmosphere and causes Earth's surface temperature to rise quickly.
4 句中called the “greenhouse effect”为过去分词作后置定语，which 引导非限制性定语从句。
5 句中that 引导同位语从句。
There is strong and comprehensive⑦ evidence that the rise in temperature has led to an increase in extreme weather and natural disasters worldwide, not only
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causing serious damage, but also costing human lives.6 Climate scientists have warned that if we do not take appropriate actions, this warming trend⑧ will probably continue and there will be a higher price to pay. In fact, news reports are frequently⑨ broadcast⑩ about extreme rainstorms and heatwaves causing deaths and economic losses.
6 句中that 引导同位语从句，“not only...but also...”连接两个作状语的现在分词。
教材原文
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
教材原文
causes and impacts, because this is the most serious issue affecting all of us on this planet.7 So what will you do to help？
7 because 引导原因状语从句，主句中it 作形式主语，动词不定式to seize...warming为真正的主语。
课文翻译
气候变化需要全世界的关注
我们了解气候变化已有数十年之久了。毫无疑问，地球正变得越来越温暖(如图)。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。
2013年，在挪威的北极圈斯瓦尔巴群岛的一个岛上，(人们)发现了一只死亡的北极熊，这张新闻图片令许多人感到震惊。据发现北极熊尸体的科学家说，这只北极熊仅剩“皮包骨”。一位长期研究北极熊的专家说，从尸体的姿势看，这只北极熊像是饿死的。专家称，气候变化导致
课文翻译
的海冰面降低意味着北极熊无法像以前那样捕食海豹，于是它只能长途跋涉去寻找食物。这一令人惊恐的案例反映了气温上升对地球生态造成的影响。
那么，到底是什么导致全球平均地表温度上升呢？气候科学家常常会提到一个关键的气候过程——“温室效应”；它有两个常见的含义：“天然”温室效应和“人造”温室效应。“天然”温室效应指的是来自太阳的热量以短波辐射的形式进入大气层，使地表变暖。这一热量以更大的波长被释放回大气层。大气层中甲烷、二氧化碳等温室气体困住了
课文翻译
部分热量，从而使地球保持气候温暖、适宜居住。如果没有这一过程，地球就无法维系生命。然而，“人造”温室效应现在却成为一个大问题。当人类由于燃烧化石燃料产生了大量额外的温室气体，更多的热能被困在大气层中，导致地表温度迅速上升。
确凿、全面的证据表明，温度上升导致全球极端天气和自然灾害增多，不仅造成严重破坏，而且使人丧命。气候学家已发出警告：如果我们不采取适当的行动，这种变暖的趋势可能会持续下去，而我们将为此
课文翻译
付出更大的代价。事实上，有关极端暴风雨和热浪造成死亡和经济损失的新闻报道已屡见不鲜。
温室气体的持续排放将导致全球气候进一步变暖，并带来持久的变化。这需要全世界人的关注。各国政府需要考虑制定政策并采取适当的行动和措施以减少温室气体的排放。作为个人，我们可以通过限制生活方式产生的二氧化碳量来减少我们的“碳足迹”。我们有责任抓住每一个机会，教育每个人了解全球变暖，包括其成因和影响，因为这是影响这个星球上我们所有人的最严重的问题。那么，你会做些什么来贡献力量呢？
Step 1　Fast-reading
Ⅰ.Read the passage quickly and fill in the following blanks with suitable words.
Para.1: Earth is getting warmer and warmer which has caused ①
change.
Para.2：The ② of the global climate change.
Para.3: The “greenhouse effect” is causing the increase in the global average surface ③ ．　
climate
effect
temperature
Para.4：The warming trend is causing deaths and ④ losses.
Para.5：People all over the world should pay attention to the ⑤
greenhouse gas emissions.
Ⅱ.The main idea of the text is ．
economic
continued
that the global climate change caused by the “man-made” greenhouse effect requires the world's attention
Step 2　Careful-reading
Read the passage again and choose the best answers.
1．What's the main reason for the global climate change
A．The “natural” greenhouse effect.
B．The “man-made” greenhouse effect.
C.Methane and carbon dioxide.
D．Short-wave radiation.
2．From the second paragraph we can learn that ．　
A．all the polar bears have died of starvation
B．the expert knows nothing about the polar bear
C．the polar bear couldn't find enough food because of climate change
D．the polar bear liked travelling long distances
3．What's the main idea of the fourth paragraph
A．The increasing extreme weather.
B．The consequences of high greenhouse gas emissions.
C．The warming trend will last for a long time.
D．People will pay a high price.
4．According to the passage， help(s) Earth sustain life.
A．the “natural” greenhouse effect
B．the “man-made” greenhouse effect
C．carbon dioxide released into the atmosphere
D．greenhouse gases produced by people
5．What's the main idea of the passage
A．The long-lasting changes to the global climate.
B．The decreasing number of polar bears.
C．People all over the world should pay attention to climate change.
D.The “greenhouse effect” has become a big problem.
答案　1.B　2.C　3.B　4.A　5.C
Step 3　Post-reading
After reading the passage，please fill in the following blanks.
There is little doubt that Earth is getting warmer and warmer.In 2013，many people 1. (shock) by a news photo of a dead polar bear which appeared to have starved and died.Experts claimed that low sea-ice levels 2. (cause) by climate change meant the bear could not hunt seals as before，so it had to travel greater distances 3. (find) food.Then what is causing the increase in the global average surface temperature？Climate
were shocked
caused
to find
scientists often mention a key climate process called the “greenhouse effect”，4. has two common meanings: the “natural” greenhouse effect and the “man-made” greenhouse effect.The “man-made” greenhouse effect has now become 5. big problem.There is strong and comprehensive evidence 6. the rise in temperature has led to an increase in extreme weather and natural disasters worldwide.In fact，news reports are 7. (frequent) broadcast about extreme rainstorms and heatwaves
8. (cause) deaths and economic losses.Continued greenhouse gas
which
a
that
frequently
causing
emissions will result in further warming and long-lasting changes to the global climate.This requires the attention of people all over the world.We as individuals can reduce our “carbon footprint” by 9. (restrict) the amount of carbon dioxide our lifestyles produce.It is our responsibility
10. (seize) every opportunity to educate everyone about global warming.
restricting
to seize

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