Unit3 Reading and Thinking ppt课件-（2022新）人教版高中英语选择性必修第三册.pptx

1、 To discuss climate change To learn to identify the style of this text and infer the writers purpose To learn to draw a diagram To think about how we can do to deal with climate change What can you see in the photo? What will happen if glaciers are melting faster than before on earth? Vast quantitie

2、s of water are locked up as ice in Greenlands giant sheets, yet these sheers are melting at increasing rates. In the past decade 3.5 trillion tons of ice has melted on the island. Thats enough melted ice to cover the entire United Kingdom in 15 metres of water.Climate change is a heat topic for the

3、scientists around the world. They all try to find out the truth about these questions: What causes the climate change? What are the solutions to stop climate change?View the video. What other consequences may global warming bring about?The effects are destructive as follows:1. The sea level to rise.

4、 2. Severe storms, droughts, famines, the spread of diseases, insect outbreaks and destruction of species.3. Wide animals died because of starvation.4. Wildfire occurs frequently because of the extreme hot weather.5. Threaten ecosystems and economic losses.1. What type of writing is this passage?A.

5、Argumentative writing B. Narrative writingC. Expository writing D. Advertising writingC2. In which part of a newspaper or magazine may we find this passage?A. Entertainment B. EconomyC. Education D. EnvironmentDRead the passage quickly, and choose:本文是一篇本文是一篇说明文说明文。说明文是客观说明事物的一种文体，。说明文是客观说明事物的一种文体，以解

6、说或介绍事物的形状、性质、成因、构造、功用、类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。确为基本要求，强调科学性和客观性。Read the text quickly, and figure out its structure.Part Para. Main idea12341-2The evidence of dramatic climate change

7、 that had an impact on Earths ecology3The causes of the increase in the global average surface temperature 4The consequences of the rise in temperature5The solutions to reducing greenhouse gas emissionsThe problemsRead the text carefully, and answer the questions.1. What evidence of climate change c

8、an you find in the first paragraph?a warming ocean and atmosphere; melting ice; rising sea level2. What is the graph about? What information can you get from it?Part 1(Para.1-2) The problemThe graph shows the change in the Global Surface Temperature between 1920 and 2016. It shows the temperature an

9、omaly, which shows how much the temperature has risen above what it would usually be at a base level.anomaly n. a thing, situation, etc. that is different from what is nomal or expected 3. What happened to the polar bear in the photo? The polar bear in the photo died of starvation. Why did the write

10、r write about it? The writer wrote about it because it showed one of the effects of rising temperatures due to climate change.Climate change low sea-ice levels bears could not hunt had to travel greater distances to find food starved to death its dead body found 4. Can you use your words to describe

11、 how climate change have influenced the polar bears life?Keeping Earths warm and habitable, sustain life1. Read Paragraph 3, and figure out the reason why earths temperature rising.Greenhouse effect“Natural” greenhouse effect“man-made” greenhouse effectCausing Earths surface temperature to rise quic

12、kly if too much heat energy is trappedimportanta big problemPart 2(Para.3) The causesKeeping Earths warm and habitable2. Can you draw the diagrams to describe how the greenhouse effect works?Greenhouse effect“Natural” greenhouse effect“man-made” greenhouse effectCausing Earths surface temperature to

13、 rise quickly if too much heat energy is trapped3. What are the benefits of using diagrams? visualise the problem more clearly; demonstrare your creative thinking and problem-solving. 1. What are the consequences of global temperature rise? Finish the mind map below.The rise in temperature led to ex

14、ample resultsextreme rainstorms, heat wavesserious damage, costing human lives, economic lossesextreme weather/ natural disastersPart 3(Para.4) The consequences2. Why did the author mention the climate scientists warning?Because global warming needs everyones attention and it is essential that we ta

15、ke appropriate actions. Make policies Take appropriate actions and measuresPart 4(Para.5) The solutionsgovernentsindividuals Reduce our carbon footprint by restricting the amount of carbon dioxide our lifestyles produce Educate everyone about global warming, along with its causes and impacts What is

16、 a question left at the end?In Paragraph 5, the author hopes everyone can take actions to reduce our “carbon footprint”. As individuals, what can we do in our daily life to help to minimize climate change? Use renewable energies Choose energy-efficient products Reduce food waste Buy products made wi

17、th recycled content Take green transportation Use water efficiently Take shorter showers Plant more trees wherever you can Get involved!Share your knowledge!In this passage, what writing techniques does the author use in order to achieve his/her purpose? a graph a photo explanation comparison scient

18、ists and experts quotes examples raise a question The “natural greenhouse effect” refers to. Without this prcess, earth could not sustain life. However, the “man-made greenhouse effect”has now become a big problem. According to the scientists who found. An expert who has studied polar bears. said th

19、at. Experts claim that. Climate scientists have warned that if we. Governments need to consider making policies and taking appropriate actions and measures. We as individuals can also reduce our “carbon footprint” by. So what will you do to help? Writing prupose: To inform readers of global warming,

20、 convincing and inspire them to do whatever they can do to deal with this problem.Earth provides enough to satisfy every mans needs, but not every mans greed. Mohandas K. GandhiWhat is the difference between “needs” and “greed”?How do you understand the quote? Nature has evolved to provide enough to

21、 satisfy the basic needs of all living things. However, nature cannot provide enough to satisfy everyones greed, because greed is a desire that can never be satisfied.Choose the right item from the box to make the summary complete. Change the form when necessary.starve, natural, ecology, natural dis

22、aster, carbon footprint, fossil fuel Warming oceans, melting ice and rising sea levels prove climate change is happening. Its shocking impact on Earths 1. _ could be seen in a 2013 photo of a polar bear on the Norways Arctic island of Svalbard that had 2. _ to death. Unable to hunt seals as before,

23、scientists concluded low sea-ice levels due to climate change had forced it to travel long distances to find food. ecology starvedstarve, natural, ecology, natural disaster, carbon footprint, fossil fuelWhen explaining climate changes causes, scientists often talk about two types of “greenhouse effe

24、ct” “3. _” and “man-made.” As the sun warms Earth, greenhouse gases in the atmosphere such as methane and carbon dioxide trap some heat in, making Earth warm enough to live on. Extra man-made greenhouse gases from burning 4. _ however trap even more heat in the atmosphere, leading to extreme weather

25、 and 5. _. natural fossil fuels natural disasters starve, natural, ecology, natural disaster, carbon footprint, fossil fuelScientists warn of more disasters to come if this man-made global warming is not stopped. Both government and individual actions are required to reduce the carbon dioxide or “6. _” our lifestyles produce. So what will you do to help with the most serious issue?carbon footprintCreate a carbon footprint survey, carry out the survey and then use the results to come up with ways to reduce carbon footprints.