课件24张PPT。Unit 4 Global warming The earth is becoming
warmer-But does it matter? Match the words or phrases with the proper explanations.
_____________ aimless, without any purpose.
2. ____________ agree with, support .
————— often do a particular thing especially
something bad and likely to do it again.
4. _________ to disagree with something and try to
prevent it from happening.
5. __________ not to cold or wet or not serious .
6. __________something burnt to make heat or energy.
randomsubscribe totendopposemildfuel 1. What is a greenhouse made of and used for?
2. How does it
work?
A greenhouse is made of glass and is used for growing plants, especially during cold weather.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.What’s wrong with our earth?methaneCarbon dioxideWater vapourWhat is the main topic of the article ?Skimming
Global warming
What are the names of the three scientists mentioned in the article?
Dr. Janice Foster
Charles KeelingGeorge Hambley
Answer the question while listening
True or false1.The temperature in 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 temperture.
4.The rise in carbon dioxide has caused a steady increase in temperature.
5.George Hambley is worried about the effects of carbon dioxide.
6.It is clear what the effects of global warming will be.
FFTTFFCareful Reading
Part 1(para1)Part 2(para 2—5)Part 3(Para 6)
Part4(para 7)it is up to readers to decide whether they should stop global warming or notdescribes how global warming comes about introduces the issue of global warminglists two different altittudes towards global warmingCareful Reading
1. How has the global warming
come about?
Human activityBurning fossil fuels greenhouse gases coal
natural gas
oilcarbon dioxide methane
water vapourglobal warmingextra carbon dioxide2. What are the effects of global warming?Careful Readingcause the sea level to rise
severe storms
droughts
famines
the spread of diseases
destruction of speciesPositive effects Negative effects make plants grow faster
crops will produce more
a greater range of animals
make life betterMaybe… The sea level will riseMaybe…There will be some disasters,
such as…flood!droughtfamine
forest fire!…What shall we do to stop global warming?HomeworkWrite a short passage about how to protect the environment.Thank you