Using a question, leaving readers to think over the issue.
I. Read the text carefully and fill in the blanks.
Scientists Opinion Janice Foster ◆ We need ______ gases like carbon dioxide, methane and water vapour, but if we add huge quantities of extra carbon dioxide ___________ to the atmosphere by burning fossil fuels, it will cause the global temperature to go up. ________________
• How does it work? The air inside is warm because the glass traps 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.
Scientists Opinion
Janice Foster ◆ Over the next 100 years the amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees Celsius. ◆ An increase of five degrees would be a ___________. catastrophe
(Paragraph 1) Introduce a debate Raising a question over the issue of global warming.
Main ideas of each part
Writing techniques
Giving examples, (Paragraphs 2– 3) using graphs, Illustrate how global warming comes explanation. about.
fridge stove
water (hydroelectric)
renewable renewable
plant waste (biomass energy)
washing hot springs or geysersrenewable machine (geothermal energy) the sea (tidal hairdryer energy) renewnewable?
Renewable or non-renewable?
What is told in the picture?
What is the greenhouse made and used for?
A greenhouse is made of glass and is used for growing plants, especially during cold weather.
• What are the “greenhouse gases”? In the atmosphere surrounding the earth there are gases called “greenhouse gases”, including carbon dioxide, methane (甲烷, 沼气) and water vapor.
人教课标 高二 选修 6 Unit 4
From the following pictures, you will know where all this energy comes from.
windmills
a coal power station
an oil refinery
a nuclear power plant
• What do you think greenhouse gases do? They trap the heat of the sun and keep the air surrounding the earth warm.
Main ideas of each part
Writing techniques
(Paragraphs 4– 5)
List two different attitudes among scientists towards global warming.
Giving examples, making contrast.
(Paragraph 6)
It’s up to readers to think and decide whether people should do something about global warming or not.
television cassette player
video recorder
natural gas
nonrenewable
wind (wind power)
sun (solar energy)
renewable renewable
uranium noncomputer (nuclear energy) renewable
solar panels
hydro-electric dam
Sample lists
Things that Sources of use energy energy Renewable / non-renewable
light heating
coal
non-renewable
oil
non-renewable