Unit 4 Global warming

Learning Aim: Know well the global warming Emotion Aim: Save energy and protect environment

What do you think causes global warming?  It is human activity that has caused this global warming. Lead--in

1.Who wrote the magazine article? What is the name of the magazine? Sophie Armstrong Earth Care Skim the passage and answer the following questions:

Dr. Janice Foster 2. What are the names of the three scientists mentioned in the article? Charles Keeling George Hambley

3 What is the main topic of the article?  Global warming/ The warming of the earth

4. What are the two graphs about? The first graph shows: The second graph shows: the temperature increase of one degree Fahrenheit between 1860 to the carbon dioxide content in the atmosphere from 1957 to P26

Match the main idea of each part. Part 1 (1) Part 2 (2-5) Part 3 ( 6) Introduce a discussion over the questions of global warming. Scanning Explain how global warming comes about. List two different attitudes among scientists towards global warming. Let readers decide whether people should do something about global warming or not. Part 4 (7)

Match the parts with the writing skills Usinga question, leaving readers Using a question, leaving readers to think over the issue Raising a question Raising a question Giving examples, making contrast Giving examples, using graphs, explanation I(1) II (2-5) III (6) IV (7)

How has global warming come about? Human activity Burnig of fossil fuels Greenhouse effect Greenhouse gases The global warming

carbon dioxide Fossil fuel( 矿物燃料 ) coal oil gas global warming ● ● ● ● ● ●● ● ● ● ● ● produce

? CH4 Water vapour Carbon dioxide methane Greenhouse gases

green house effect

3.The different ideas between Dr. Janice Foster & George Hambley Dr. Janice FosterGeorge Hambley Carbon dioxide has caused the global temperature to __________. An increase of five degrees would be a ____________ and could be ______________. More carbon dioxide is actually a _______ thing,it will make plants____________; crops will _______ more and will en- courage _________________ go up catastrophe very serious positive Produce a greater range of animals growquicker

Read the passage carefully and judge whether the statements are true or false? 1The temperature in the last century did not seem to increase much. 2Everyone believes that global warming is caused by the activities of humans. 3Janice Foster believes that she can measure the future global rise in temperature. T T F

 4 The rise in carbon dioxide is causing a steady increase in global warming.  5 George Hambley believes that global warming will do good rather than harm to the earth.  6 It is clear what the effects of global warming will be. T F T

What are the effects of global warming? ( good / bad sea level to the spread of diseases, and the destruction of species.  Make plants grow faster;  Crops will produce more;  It will encourage a greater range of animals Reference

What can we do about global warming ? Tomorrow, where can we go ?

What can we do to control the greenhouse effect?

Let us save energy and protect environment together.

Homework 1.List at least three reasons for global warming. 2.Find out the language points in this unit.