Unit4_Global_warming课件16(新人教版选修6）.ppt

Unit 4 Global warming Reading;Pre-reading;;;1. Have you ever seen a greenhouse?;2. How does the greenhouse work?;The air inside was warm because the glass traps(挡住, 吸收) the heat from the sun and keeps it from escaping(逃跑). This makes the greenhouse heat up(热量 上升) and so the plants can grow throughout(在…期间) the cold period.;3. What are Greenhouse Gases?;4. Greenhouse Effect ;Greenhouse effect;Green house effect;;THE EARTH IS BECOMING WARMER BUT DOES IT MATTER? ; ;Main ideas of each part:;;Are the risks too great?; ;2. ___________________________;;Read and answer the questions. 1. Who wrote the magazine article? What is the name of the magazine? 2. What are the names of the three scientists mentioned in the article?;3. What do the three scientists think about global warming? ;The different ideas between Dr. Janice Foster George Hambley;4. What are the two graphs about?;from around 315 parts per million to around 370 parts per million;1. Who found out the amount of carbon dioxide in the atmosphere from 1957 to 1977? A. Dr. Janice Foster. B. Charles Keeling. C. George Hambley. D. Sophie Armstrong.;2. Which of the following is Dr Janice Foster’s opinion? A. The result of the temperature increase will be serious. B. The amount of warming is nothing serious. C. We needn’t worry about high levels of carbon dioxide. D. Global warming is a natural phenomenon.;3. Which of the following is TRUE according to the text? A. The temperature of the earth increased about one degree Fahrenheit during the 20th century. B. The carbon dioxide content in the air increased by 70 parts per million from 1957 to 1997. C. All scientists accept the data in graph 2 except Charles Keeling. D. Janice Foster says that more carbon dioxide will make plants grow faster.;4. The author