Unit 4 Global Warming Period 1 reading Learning aims: 1. Know well the global warming2. Enable the students to talk about different sources of energy.Important point: Learning about effect the global warming brings human being.Difficult point: To improve the skills of reading.使用说明及学法指导：1. 通过阅读课本 P25-27，完成预习案。2. 完成时间：30 分钟。预习案 Previewing CaseTask 1 Divide the text into 4 parts and match the idea of each part.Part 1(Para __) Two different attitudes among scientists towards global warming. Part 2 (Para __ to __) Whether people should do something about global warming or not. Part 3 (Para __to _) How global warming comes about.Part 4 (Para __) Introduce a debate over the issue of global warming.Task 2 Careful readingPart 1 1) Who wrote the magazine article? What is the name of the magazine? ______________ _________________Part 2 2) What are graph 1 about?______________________________________________________________3) What is the reason of the increase in the earth’s temperature? _________________________________________________________________________________________4) What will happen if we add quantities of carbon dioxide into the atmosphere?_________________________________________________________________________________________Part 3: List Charls Keeling’s, Dr. Janice Foster’s & George Hambley ‘s the ideasCharls KeelingDr. Janice Foster George HambleyGraph2 shows that carbon dioxide content of the atmosphere 5)_________From 1957 to 1997.Carbon dioxide has caused the global temperature to 6) ________. An increase of five degrees would be a 7)_________ and could be 8)______________.More carbon dioxide is a 9)__________ thing,which makes crops 10)__________ more and will en-courage 11)_____________________...
