课件40张PPT。Unit 4 Global warming
Warming up and reading
We depend on energy to do many things in our daily lives. For example, energy lights our cities and heats our buildings. Make a list of things that use energy in your home, in your school, or any other places you can think of. things that use energy in our life lamp things that use
energy in our life micro-wave oven cassette player heating television hairdryer video player fridge computer washing machinestoveDo you know how energy is produced?
How many sources of energy can you list?Wind energy is used as power to
produce electricity. windmillsElectricity is produced by burning coals.coal power stationsOil is refined and made pure. oil refineriesNuclear energy is converted into electricity.nuclear power
plant
pieces of equipment on a roof that collects energy from sunlight in order to heat water and produce electricity solar panelsWater are kept back and raised its level for irrigation or for producing electricity.hydro-electric
damsgeothermal (地热的) energy plantElectricity is generated from hot dry rocks. An energy source is “renewable” when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable?What is the building made of and what is it used for? It is made of glass and plants can grow in it when the weather is cold outside.Have you ever seen a greenhouse?How does it work?The air inside is warm because the glass trap the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period.What are the “greenhouse gases”?
What do you think greenhouse gases do?greenhouse effectWhat’s greenhouse effect?Greenhouse gases perform the same fun_ction as the glass in a greenhouse --- they trap the heat of the sun and keep the air surrounding the earth warm.Global warming / The warming of the earth.Skim the text and find out the main
topic of the article.What is the purpose of the first paragraph?To introduce the topic.What are the diagrams for?To illustrate points by providing evidence.Read the text quickly and answer the questions:Who wrote the magazine article? What is the name of the magazine?
What are the names of the three scientists mentioned in the article?
What do they think about global warming? Do they agree with one another?
What are the two graphs about?
What is the main topic of the article?Sophie Armstrong wrote the magazine article. The name of the magazine is “Earth care”.2. What are the names of the three
scientists mentioned in the article?They are Dr. Janice Foster, Charles Keeling and George Hambley. Who wrote the magazine article? What is the name of the magazine?3. What do they think about global warming? Do they agree with one another?There are some very different attitudes among scientists towards this issue. Some think the effects will be terrible, while some others believe that we should not worry about it. 4. What are the two graphs about?Graph 1 shows the temperature increase of one degree Fahrenheit between 1860 to 2000.Graph 2 shows the carbon dioxide content in the atmosphere from 1957 to 1997.Choose the best answers.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.B2. “But there are some very different
attitudes among scientists towards this
issue.” “issue” here means the same as
the one in ___. A. I bought the new stamp the day of its
issue. B. They are talking about one of the key
issues in the election campaign. C. The government is expected to issue a
statement about the election. D. The magazine has 12 issues each year.BC3. The author probably agrees that ______.
A. actually global warming is good
for man B. we should do nothing about the
global warming C. catastrophes will happen if the
globe keeps on warming D. a lot remains to be found out about
the effects of global warming.The different ideas between Dr. Janice Foster & George Hambleygo upcatastrophevery seriouspositiveproduce more a greater range of animals The temperature last century didn’t
increase much.
2. Everyone believes that global warming is caused by the activities of humans.
3. Janice Foster believes that she can
measure the future global rise in
temperature.True or false TTF4. 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. TTFConstruction Part 1
(1)Introduce a debate over the issue of global warming. Main idea of each partIt has a title, a first paragraph that runs across the page and is in bold, the main text in two columns, graphs /diagrams, two quotes.What is the structure of a magazine like this and how is the text organized? What are the effects of global warming?DiscussionA: We shall do something about global warming.B: We shall do nothing about global warming.DebateReview the text and pay attention to the use of it.
Find out the important and difficult words and expressions to you.
