Unit 3Readingand thinking ppt课件-（2019版）新人教版选择性必修第三册高中英语.pptx

1、Unit 3 Environmental ProtectionReading and ThinkingPhrases: carbon dioxide; fossil fuel1Read about different environmental problems.23Words: emission; melt; starve; ecology; release; carbon; sustainLook at the following pictures and discuss what green gas is and how it form.Lead instarve v. 使挨饿；饿死使挨

2、饿；饿死Language point【拓展】starve to death饿死starve for渴望；急需adj. starving 饥饿的；挨饿的n. starvation 饿死；挨饿；绝食1. A number of the prisoners we saw are starving. 我们看到的许多囚犯都快饿死了。2. You cant see people starve without trying to help them, can you? 你不会坐视人们挨饿而不想办法去帮助他们吧?release v. 释放；排放；发布释放；排放；发布1. Action had been tak

3、en to speed up the release of cheques. 已经采取行动加速支票的发放。2. He gave the okay to issue a new press release. 他同意发布一篇新的新闻稿。【拓展】free, liberate, release, discharge 这些动词均含这些动词均含解放，释放解放，释放之意。之意。free : 指不再受任何限制、约束、阻碍和压迫，完全可按自己的意志行事。liberate : 常指从束缚和压迫中解放出来，强调获得最终的解放release : 侧重指放松限制、解除监禁或免除义务。discharge : 强调把某人或

4、某物从监禁、束缚中释放出来。sustain v. 维持；承受住；遭受维持；承受住；遭受1. During the war, we didnt have enough food to sustain us. 战争期间,我们没有足够的食物维持生活。2. These four posts sustain the entire building. 这四根柱子支撑着整座建筑物。【拓展】back, uphold, support, sustain, advocate 这些动词均有这些动词均有支持，支援，拥护支持，支援，拥护之意。之意。back : 通常指对论点、行动、事业等的强有力支持。uphold :

5、既可指积极努力对陷入困境者的支持，也可指给某人在行动、道义或信仰上的支持。support : 含义广泛，多指在道义上或物质上支持某人，也可指对某项事业的支持。sustain : 侧重指连续不断的支持。advocate : 多指通过写文章或发表演说等来支持或拥护，往往暗示提倡某事或为某事辩护。emission n. 释放释放More and more people attach importance to reducing greenhouse gas emission.越来越多的人开始重视减少温室气体排放.Total air pollutant emission control plannin

6、g is a major urban environmental management approach.大气污染物总量控制是控制城市大气环境污染主要管理手段.Climate Change Requires Worlds AttentionWe 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

7、 and rising sea levels provide evidence of a dramatic change in the global climate.In 2013, a lot of people were shocked by a news photo of a dead polar bear that was found on Norways Arctic island of Svalbard. According to the scientists who found its dead body, all that remained of the polar bear

8、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 great

9、er distances in order to find food. This alarming case showed how the increase in temperature had an impact on Earths ecology.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 tw

10、o 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 Earths surface as short-wave radiation. The heat is released back into space at longer wave lengths. Greenhouse

11、 gases in the atmosphere, such as methane and carbon dioxide, trap some of the heat, keeping Earths 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 greenhou

12、se gases by burning fossil fuels, more heat energy is trapped in the atmosphere and causes Earths surface temperature to rise quickly.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 se

13、rious 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 deat

14、hs and economic losses.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 greenh

15、ouse 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 ser

16、ious issue affecting all of us on this planet. So what will you do to help?1 What is the graph about what information youll get from it?2 Have you ever seen the photo before? What might be the story behind it?ContentWe can see the global surface temperature.Yes, it may be about environment.1 Before

17、read, look at the graph and the picture below and discuss these questions in groups.What happened to the polar bear in the photo? Why did the Writer write about it?Why is the “natural” , greenhouse effect important and necessary?What are the consequences of high greenhouse gas emissions?Why did the

18、author mention the climate scientists warning?What is the authors purpose of writing this text?They appear to starve and die. He wants us to protect our environment.Without it, the earth can not sustain life.It can lead to extreme weather and natural disastersTo prevent us from paying a higher price

19、.He wants us to protect our environment2. Read the text and answer the questions.3 Read the text again and create a diagram describing how the greenhouse effect works.4. Discuss these questions in groups 1 What examples of extreme weather and disasters do you know? Can you make a list?2 Do you think climate change is the result of human activity? Give your reasons.3 Who do you think should take responsibility for dealing With climate change? What can we do?3. 预习 Unit 3-Build up your vocabulary.1. Recite new words and phrases.2. Describe what you know about green gas.Bye-bye!