英语人教版 (2019)Unit 3 Environmental Protection教学演示课件ppt

这是一份英语人教版 (2019)Unit 3 Environmental Protection教学演示课件ppt
Unit 3 Environmental ProtectionPeriod 3 Reading and Thinking After this class, you will:l. To learn more about different environmental issues.2. To analyse the cause and effects of global warming.3. To draw a diagram describing how the greenhouse effect works.Learning ObjectivesWhat’s the environmental problem in the video? Lead-inWhat other consequences may global warming bring about? BrainstormPre-readingstarved to deathWhat might be the story behind it?What is the graph about? What information can you get from it? Pre-readingThe story may be that the polar bear suffered from the increasing global temperature.Pre-readingPre-readingReadingSkimming1. What's the type of this text?2. What's its purpose?3. In which part of a newspaper or magazine may we find this passage?1. What's the type of this text?A. Essay 论文 B. Biography 传记C. Exposition. 说明文 D. Argumentation. 议论文2. What's its purpose?To inform readers to deal with climate change To persuade readers to focus on limited resources3. In which part of a newspaper or magazine may we find this passage?A. Entertainment B. EconomyC. Education D. EnvironmentSkimming1. What happened to the polar bear in the photo? Why did the writer write about it?2. Why is the “natural” greenhouse effect important and necessary?3. What are the consequences of high greenhouse gas emissions?4. Why did the author mention the climate scientists’ warning?5. What is the author’s purpose of writing this text?Reading for detailsKeys:1. The polar bear in the photo died of starvation. The writer wrote about it because it showed one of the effects of rising temperatures due to climate change.2. The “natural” greenhouse effect is important because it warms the Earth’s surface and keeps it habitable.3. High greenhouse gas emissions lead to more heat energy being trapped in the atmosphere and rising temperatures.4. Because the writer wanted to warn us of how urgent it was for us to take appropriate actions.5. To arouse our awareness of the problem and encourage us to take appropriate measures to deal with global warming.Reading for detailsPara 1-2Para 3Para 4Para 5The evidence of dramatic climate change that had an impact on Earth's ecology.The cause of the increase in the global average surface temperature.The consequences of the rise in temperature.The solutions to reducing greenhouse gas emissionsReading for structureproblemcauseconsequencessolutionsPart 1: ProblemThe ________ is getting warmer and warmer.Evidence 1: ________________________________________Evidence 2: ______________Evidence 3: ___________________Eartha warming ocean and atmospheremelting icerising sea levelsclimatechangeclimate changestarvationlonger food-seeking travellack of foodlow sea-ice levelThe 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?Part 2: Cause and effectDefinition:Heat from the sun enters the atmosphere and warms the Earth’s surface. Function:Keeping Earth’s warm and habitable.Definition:People produce huge amounts of extra greenhouse gases.Function/A big problem:Causing Earth’s surface temperature to rise quickly.Part 3: Cause and effectPara 3: “natural”& “man-made” greenhouse effectNegative effectsnot only .but also .extreme weathernatural disasterscausing serious damagecosting human livesWhat extreme weather is mentioned in Para.4？ extreme rainstorms and heatwavesPart 4: Cause and effect Para 4: finish the following chart.Read paragraph 3,4 and create a diagram describing how the greenhouse effect works.Heat released back into spaceHeat reflected back to Earth’s surfaceReflected sunlightAtmosphere Sunlight Part 5: Solutions Para 5Climate change Evidence SolutionsCauses Effects governmentindividualsextreme weathernatural disastersGreenhouse effectnatural greenhouse effectman-made greenhouse effectPost-reading mind mapWhat will you do to help?Summary As we know，Earth is getting warmer and warmer,1.which results in melting ice and rising sea levels.In 2013，a dead polar bear 2.was found(find)on Norway’s Arctic island of Svalbard.Experts said that it was low sea-ice levels 3.caused(cause) by climate change 4.that killed the polar bear.Scientists often mention that the “man-made” greenhouse effect is a big problem.5.The rise in temperature has led to an increase in extreme weather and natural disasters worldwide，causing serious damage and costing human lives.The further global warming that results 6.from the continued greenhouse gas emissions 7.requires(require) the attention of people all over the world.Governments need to make policies and take measures 8.to reduce(reduce) greenhouse gas emissions.As individuals，we should also reduce our “carbon footprint” by 9.restricting(restrict) the amount of carbon dioxide our 10.lifestyles(lifestyle) produce.