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英语:22.1《Global warming》教案(北师大版选修8)


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Unit 22

Environmental Protection
Date:Apr.24,2012

Lesson 1 Global Warming
Teacher:Wang longshui

Teachi

ng aims: By the end of this lesson, students will 1. have a better understanding of what global warming is 2. know the serious consequences that global warming may cause 3. realize the importance that we need to take action Teaching methods: Prediction, pair work, fast reading, careful reading, group discussion Teaching aids:Multi-media Teaching procedures: Step 1 Revision 1. Ask students to say out several kinds of environmental problems. 2. Match the Key Words with their Chinese meanings consensus bounce agriculture coincidence condemn reservation sacrifice advocate Step 2 pre-reading 1. Lead- in Use some pictures to lead to the topic--- Global Warming. Ask students which countries contribute more to global warming: developed countries or developing countries. 2. Prediction Based on the title “Can we take the heat”and some pictures, enable students to predict : What is the text about? Step 3 While-reading 1. First reading (pair work) Match the headings with the paragraphs. Para 1. Draw readers’ attention to the topic by asking questions. Para 2. What should human beings do. Para 3. What is global warming. Para 4. Consequences of global warming. Para 5. What cause global warming 2. Second reading Read the text carefully and answer the following questions. (1)What is global warming? (2) What human activities are causing global warming? (3) By how much has the global average temperature increased in the last 100 years? (4) Are greenhouse gases necessary for life on Earth? (5)How can each of us help solve the problem of global warming? Step4 Post-reading Listen and Complete the form
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Para.1

Introduction: Human beings are causing____ and it is believed that ________ could be one of the biggest______ in the 21st centry. Definition: Gloable warming refers to_____ in the Earth’s temperrature that, in turn,______ climate change. Causes:Many experts insist that the blame for this global warming can mostly____. Consequences: If we continue to produce greenhouse gases______. There will be more______ such as floodings, heat waves and droughts. Action: All governments have a responsibility to ____ and each person should_____.

Para.2

Para.3 Para.4

Para.5

Step 5 Group discussion What do we learn from today’s lesson? What will we do to protect our environment in our daily life? What will we do every day to help reduce greenhouse gases? We can do: energy-saving light bulbs, recycled paper, low-flow shower head, public transport , switch off… Step 6 Summary Fill in the blanks about the text. Global warming means an average increase in the Earth’s temperature which causes climate change in turn. Scientists think it is ______ ______ that cause global warming, especially gases from ________ and vehicles which speed up global warming. They also think global warming is one of the biggest environmental problems in the 21st century. The Earth’s temperature is controlled by __________ _____like carbon dioxide which ___ heat from the sun in the Earth’s atmosphere. Many experts believe global warming is mainly caused by human ________. Over the last 100 years , the global average temperature has increased _______ and if human beings continue to pump __________ gases into the Earth’s atmosphere, the global warming will cause dramatic climate changes like more frequent floods, _________ and Droughts. There are some serious diseases. Sea level will be ______ , floating coastal area , negatively affecting ______ and forestry. So governments all over the world should reduce the ______of greenhouse gases. We individuals should pay ________ to what we are doing, even small changes like ______ public transport, ________, using low-flow ____________, buying energy-efficient ___________ using recycled paper or ___________ lights can have __________ on the future of the Earth . Step 7 Homework 1. Finish Exercise 5 on page 7 2. Preview Grammar--- Reporting
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