Unit 4 Global warming Reading 课件--高中英语人教版选修六.pptx

WhatHowWhyUnit 4 Global WarmingUnit 4 Global Warming The earth is becoming warmer-but does it matter?The earth is becoming warmer-but does it matter?From a magazine:Earth CareA lead-in paragraph to lead into the topic and give an overview pictures/graphs/quotes Dr Janice Foster explains:“.”She says,“.”Hambley states,“.”Tip:We can often get the main idea of a magazine article by glancing at the title,the lead-in paragraph,and the graphs/pictures/quotes.Sophie Armstrongto support the idea by providing solid evidence so as to make the article more scientific and convincingThe earth is becoming warmer./Global warmingHow has this come about?Does it matter?Topic/PhenomenonCausesEffectsSolutionsTitle +A lead-in paragraph to lead into the topic and give an overview Unit 4 Global WarmingAttitudes F1 F_C。0.6It probably does not seem much to you or me,but it is a rapid increase when compared to other natural changes.Topic/PhenomenonThe earth is becoming warmer./Global warmingStatement +A graphDuring the 20th century the temperature of the earth rose about one degree Fahrenheit.40 years 55ppm 20 years 40ppm Causes Went up from around 315 ppm to around 370 ppmconcentrationWho made the accurate measurements?amountIt was Charles Keeling who 315370Para.2-5(1)Why?Whats the phenomenon?(2)What role does CO2 play in the phenomenon?(3)Where are quantities of extra CO2 from?(4)What is to blame for global warming?(5)Why is CO2 amount increasing so quickly?The temperature increase depends on the rise of carbon dioxide amount.?a natural phenomenongreenhouse gases trap heat from the sun to warm the earthWe need necessary amount of greenhouse gases and natural greenhouse effect to warm the earth,without which the earth would be about 33 C cooler.There is no doubt that it is human that is to blame for global warming.。The burning of fossil fuels to produce energy adds quantities of extra CO2 so that more heat tends to be trapped,causing the global temperature to go up.1-1.5 5 Negative Positive plants grow quicker crops produce more a greater range of animalson the one hand(Dr Foster)on the other hand(George Hambley)lead to a catastrophebe mild with few bad consequences and make life betterPara.6-7 a rise in the sea level storms,floods,droughts,famines the spread of diseases the disappearance of speciesScientists attitudesDoes it matter?Effects/Attitudes/SolutionsPara.7Para.7 Greenhouse gases continue to build up in the atmosphere.Even if we start reducing the amount of greenhouse gases,the climate is going to keep on warming for decades or centuries.No one knows the effects of global warming.Does that mean we should do nothing?Or,are the risks too great?The earth is becoming warmer-but does it matter?The earth is becoming warmer-but does it matter?Solutions?To encourage readers reflectionProblem?The author explores the topic of global warming objectively with a clear structure and solid evidence like graphs,data,and quotes of scientists so as to deepen readers understanding and encourage readers reflection about global warming and whether we should do something.Do nothingSDo something?Although we cant really know the effects of global warming,when faced with the possible great risks,its better to do than never.We cant take a risk of ruining our childrens future.The key is to_ Turn electrical appliances off when they are not in useSave energy-add less CO2Drive less;walk or ride bikes moreRecycle some material(imporve waste sorting)Buy things that are economical with energyPlant trees-absorb more CO2?What can we do about global warming?reduce the amount of CO2Reuse,recycle and reduce.Be an educator.As an educator,now you want to write a proposal on behalf of the Students Union about what we students can do about global warming.Dear fellow students,As we know,(fact+cause+possible effect).Nowon behalf of.,I appeal to you to./I suggest that.To start with,/Above all,.(proposals/suggestions)(A good conclusion)Students Union Thank you!Thank you!Thank you!Thank you!