Unit3EnvironmentalProtectionSectionAReadingandThinking（教学课件）-高中英语人教版（2019）选择性必修第三册

Unit 3 Environmental Protection MENU Leading-in While-class After-class Part.1 Leading-in Leading in What is the graph about? What information can you get fro m it? Leading in Have you ever seen the photo before? What might be the  story behind it? Leading in • What happened to the polar bear？ • How do you feel when you see the photo？ • What do you think might have caused the polar bear's  death？ • Do you think it is related to the global temperature  rise？ Part.2 While-class While-class 阅读全文，找出每一段的主题句，划分文章结构 Part Paragraph Main idea 1 1-2 The evidence of dramatic climate change that had an  impact on Earth's ecology 2 3 The cause of the increase in the global average surface  temperature 3 4 The consequences of the rise in temperature 4 5 The solutions to reducing greenhouse gas emissions While-class Part 1 Para 1 introducing the topic a dramatic change in the global climate the reason for its death Para. 2 finding a dead polar bear Global warming affected Earth' s ecology. While-class What happened to the polar bear in the photo? Why did the  writer write about it? The polar bear died from lack of food. The writer wrote about it to show how the increase in  temperature had an impact on Earth's ecology. While-class • What evidence of climate change can you find in these  two paragraphs？ • What is the author's purpose of using the graph and the  photo？ • Can you use your words to describe how climate  change have influenced the polar bears life？ While-class Para. 3 reasons for the increase in temperature the"natural“ greenhouse effect the"man-made" greenhouse effect-producing huge amounts of extra greenhouse gases While-class • Why is the “natural ”greenhouse effect important and  necessary？ • What are the consequences of high greenhouse gas emissions? •  Because greenhouse gases in the atmosphere trap some of the he at, keeping Earth's climate warm and habitable. Without this  process, Earth could not sustain life. • More heat energy is trapped in the atmosphere, which causes  Earth's surface temperature to rise quickly. While-class 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. While-class While-class Para. 4 results of the rise in temperature an increase in extreme weather and n atural disasters worldwide climate scientists calling on peopl e to take appropriate actions While-class Why did the author mention the climate scientists' warning? Because the warming trend will cause great damage to human  beings. While-class Para. 5 how we react Governments need to make policies and take measures to reduce greenhouse gas emissions. Individuals restrict the amount of ca rbon dioxide their lifestyles produce. While-class What is the author's purpose of writing this text?  To attract the attention of people all over the world to focus  on climate change and take actions to reduce greenhouse gas  emissions and the carbon footprint. Part.3 After-class After-class 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? Thank you!