高中英语人教版选修6Unit 4 Global warmingReading教案.doc

教案Unit 4 Global warmingReading: The earth is becoming warmer - but does it matter?Learning aims: 1) Learn some knowledge about the greenhouse effect and global warming.2) Know the contents of the text well by talking about this topic and reading. 3) Discuss the problem of global warming and express your own opinions.Learning difficult points: Master the main idea of the first five paragraphs by talking about the topic.Learning important points: Know about different opinions towards global warming and express our own opinions.Teaching procedures: Step I. Greetings Greet the whole class as usual.Step II. Lead-inLead to the topic by showing an article to the students and let students know about two types of greenhouse effect (natural greenhouse effect and “man-made” greenhouse effect) and their exact meanings. Step III. Analyze two graphs to learn the main idea of the first five paragraphs.From the first graph, we can see that during the 20th century the temperature of the earth rose about one degree Fahrenheit. All scientists agree with the view that the increase in the earths temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy. More such burning means more carbon dioxide added to the atmosphere. We can see clearly that the levels of carbon dioxide have increased greatly over the past decades. Higher levels of carbon dioxide means sharper increase of the temperature. The phenomenon is called global warming.There has been a debate towards global warming over the past years. Opinions about it vary from person to person.Step IV. Read the whole passage to review the main idea of the first five paragraphs and know the two different opinions.Dr. FosterCarbon dioxide has caused the global temperature to _. An increase of five degrees would be a _ and could be very _. Possible results: _(海平面上升)_(洪灾)_(恶劣的风暴)_(干旱)_(饥荒)_(疾病的传播)_(物种的消失)George Hambley:Any warming will be _ with few bad _. More carbon dioxide is a _ thing, which makes crops _ more and will encourage _.Step V. Discuss the statement: We should take immediate action about global warming. Requirement: Write down your reasons and possible measures on your learning sheetStep VI. Presentation. Ask some students to read their reasons and possible reasons loudly to the whole class.Step VII. Assignment