课件36张PPT。Unit 4
Global warming Things that consume energy video playerrefrigeratorcomputer hairdryerlight/TV/water dispensercarwashing machineenergy sourcessolar energyoilcoalbiomass energynuclearenergyhydro-electric powerwind power……natural gaswave / tidalenergy Coal
Oil
Natural gas
Uranium
(nuclear energy)
Wind (wind power)
Sun (solar energy)
Water (hydro-electric power)
Plant waste (biomass energy)
Hot springs or geysers (geothermal energy)
The sea (tidal energy)Fossil fuelsNon-renewableRenewable① What are they?② What are these buildings made of? ③What’s the use? greenhouse / glassA greenhouse is used for_____________, especially during ____ weather.Pre-readingTurn to Pre-reading 1,
Page 25.
Read & answer. growing plantscoldwww.themegallery.com_____ the heat from the sunkeeps it from _____________ the air upHow does a greenhouse work?trap…from…: keep sth in a place
存住来自…的…trapsescapingheatsIn the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”.methanewater vaporcarbon dioxideGreenhouse
gases?www.themegallery.comFossil Fuel(矿物燃料)coaloil gas● ● ● ● ● ●?produceWhat do you think greenhouse gases do?Greenhouse gases _____ the heat of the sun and therefore ______ the earth.
It is known as __________________.Nowadays our earth is becoming _____________________.greenhouse effecttrapwarmwarmer and warmerThe earth is becoming warmer
-
but does it matter?ReadingPage 26www.themegallery.comSkimmingSkim the title:
THE EARTH IS BECOMING WARMER – BUT DOES IT MATTER?What is the main topic?
The earth. B. Global warming.
C. Becoming warmer doesn’t matter.
?www.themegallery.comSkimmingWhere does this article most probably come from?Newspaper B. Novel C. Magazine ?www.themegallery.comSkimmingWho wrote the article?What is the name of the magazine?Tip: In English, some nouns begin with a capital letter(大写字母), such as names of people and places, titles of magazines, newspapers, stories and books, people’s titles(头衔), etc..Skim the first paragraph: Sophie ArmstrongEarth Carewww.themegallery.comSkimmingWhat are the names of the three scientists mentioned in the article?Dr Janice Foster,
Charles Keeling,
George Hambley www.themegallery.com1. How much did the temperature of the earth rise during the 20th century?
About one degree Fahrenheit.
2. What is the question of Sophie Armstrong?
So how has this come about and does it matter?
Para.1www.themegallery.comPara.21.What conclusion can you make from the Graph1?
The earth is becoming warmer.
2.Who is to blame for the earth’s becoming warmer?
It is human activity that has caused this global warming rather than a random but natural phenomenon.www.themegallery.com Para.3
How do human affect the earth warming up?
It is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.2. What is greenhouse gases?Greenhouse gases are some byproducts of the process of producing energy, the most important one of which is carbon dioxide.www.themegallery.com3. What is 'greenhouse effect'?
It is a natural phenomenon which happens when small amounts of gases in the atmosphere, like carbon dioxide, methane and water vapour, trap heat from the sun and therefore warm the earth.
www.themegallery.com4. What kind of problem does it begin when huge quantities of extra carbon dioxide into the atmosphere?
It means that more heat energy tends to be trapped in the atmosphere causing the global temperature to go up.www.themegallery.com1. What conclusion can you get from Graph2?The levels of carbon dioxide have increased greatly over the last 100 to 150 years.
2. What did the scientist Charles Keeling find between the years from 1957 to 1997?
He found that the carbon dioxide went up from around 315 parts to around 370 parts per million.Para.4www.themegallery.comPara.51. Do the scientists accept the data?
They accept the data and agree that it is the
buring of fossil fuels that had resulted in this increase in carbon dioxide.
2. How high will the temperature increase go?
Dr Janice Foster says that the amount of warming could be as low as 1 to 1.5 degree Celsius, but it could be as high as 5 degrees.
www.themegallery.comTip: You can know somebody’s opinion through understanding his
or what he said. What do Dr. Janice Foster and the scientist George Hambley think about the results of global warming?
Do they agree with one another? quotations(引言)
Para 6www.themegallery.comDr. Janice Foster thinks the effects of global warming could be very serious.
George Hambley thinks global warming will be mild with few bad environmental consequences. They don't agree with each other.
Para 6www.themegallery.comDoes global warming matter?Positive effects Negative effects cause the sea level to rise
severe storms
floods
droughts
famines
the spread of diseases
disappearance of speciesPositive effects Negative effects cause the sea level to rise
severe storms
floods
droughts
famines
the spread of diseases
disappearance of speciesPositive effects Negative effects make plants grow quicker
crops will produce more
a greater range of animals
make life betterwww.themegallery.comPara.71. What do we actually do now and what will happen to the climate?
We donot start reduing the amount of carbon dioxide. The climate is going to keep on warming for decades and centuries.
2. What about the effects of global warming?
No one knows.
Does that mean we should do nothing
Or,are the risks too great?www.themegallery.comThe organization of the article: IntroductionA titleBodyConclusionwww.themegallery.comSkim the body part(7 paras): Para. 1Para. 2-5IIIPara. 6IIIPara. 7IVIntroduction Body Conclusion( Paragraph 1 )Introduce a debate over the issue of global warming. Raising a questionReading(Paragraphs 2---5 ) Illustrate how global warming comes about.Giving examples, using graphs, explanation. (Paragraph 6)List two different attitudes among scientists towards global warming.Giving examples, making contrast. (Paragraph7)It's up to readers to think and decide whether people should do something about global warming or not.Using a question, leaving readers to think over the issue. www.themegallery.comIdea-sharingWhat will global warming bring to us in your opinion? I think …In my opinion…It will cause / make …www.themegallery.comAssignment Write a short passage about the effects of global warming.
Prepare the language points of this passage and underline the important ones.
After remembering the vocabulary, do the exercises on Page 28.www.themegallery.comThank You !