Unit 2 Saving the Earth
Topic2 All these problems are very serious.
Section C
In our daily life, we should face more environmental problems.
Can you say something about them?
cities, pollute, health problems
In our daily life, we should face more environmental problems.
Can you say something about them?
factories, the land and the air, dead
In our daily life, we should face more environmental problems.
Can you say something about them?
cut down, millions of,
take away the earth,
become desert
In our daily life, we should face more environmental problems.
Can you say something about them?
oxygen
a special kind of oxygen
called “ozone” (O3)
a very big hole in the ozone layer,
too much harmful radiation from the sun
In our daily life, we should face more environmental problems.
Can you say something about them?
CO2 carbon dioxide
increase a lot, form a “blanket”,
the heat from the sun can’t escape
cause the level of the sea to rise
called “the greenhouse effect”
or “globe warming”
What other kinds of environmental problems
can you think of?
Talk about them with your classmates.
Can you match them?
traffic pollution
factory pollution
more carbon dioxide
the ozone layer
fewer trees
Fewer trees
Factory
pollution
Traffic
pollution
The ozone layer
More carbon
dioxide
All these problems are very serious. What can we do
to solve them?
Can you choose a suitable title for each
paragraph from the phrases below?
The earth is 4 600 million years old. We humans
have lived on earth for only 35 000 years, but during
this period we have changed our planet a lot in many
ways. Some things we’ve done are very good for the
earth while some are bad.
Fewer Trees All over the world, people have cut down
_________
millions of trees. When it rains or when the wind
blows, the earth is taken away. Forests have become
deserts, so more and more sorts of animals and
plants are disappearing.
Traffic
Pollution In big cities, cars and buses have
____________
polluted the air. Many people in cities now have
health problems.
Factory Pollution
_____________Factories
have also polluted the
land and the water. As a result, many rivers and
lakes are now dead.
The Ozone Layer Around the earth, there’s a
_____________
special kind of oxygen called “ozone”(O3). It is
important to the earth. But now air pollution is
destroying it and that has made a very big hole in
the ozone layer. Too much harmful radiation from
the sun passes through the hole and reaches the
earth directly. This is very dangerous because this
kind of radiation can cause cancer.
More Carbon Dioxide Carbon dioxide (CO2) in the
________________
air has increased a lot. It mainly comes from
burning oil, coal and wood. This has formed a
“blanket” around the earth. The heat from the
sun can’t escape so the temperature is rising.
This is called “the greenhouse effect”. It
causes the level of the oceans to rise and the
climate of the earth to change.
All these problems are very serious, so we
must do something now.
Read 1a again and choose the best answers.
1、What does our planet mean here?
A. The sun.
B. Mars.
C. The moon.
D. The earth.
Read 1a again and choose the best answers.
2、Which is NOT true?
A. Cars can pollute the air.
B. Factories can pollute the water.
C. The fewer trees, the better.
D. Not all the things we have done are good for the earth.
3、The word it in the passage refers to ____.
A. CO2 B. O3 C. O2 D. H2O
Read 1a again and choose the best answers.
4、In the passage, “blanket” refers to ____.
A. carbon dioxide around the earth
B. the ozone layer in the sky
C. the forests around the world
D. pollution all over the world
5、The level of the oceans is rising because of ____.
A. pollution
B. few trees
C. the greenhouse effect D. changes in the climate
Read 1a again and choose the best answers.
6、What is the best title for this passage?
A. Environmental Problems
B. Pollution on the Earth
C. Hope for the Future
D. The Greenhouse Effect
Written work
Discuss the meanings of the following expressions
and then write down how they affect the
environment.
O3: A special kind of oxygen called “ozone”
Ozone is very important to the earth.
The ozone layer can prevent the sun's harmful
radiation from reaching the earth. But now air
pollution is destroying the ozone layer. This is very
dangerous because this kind of radiation can
cause cancer.
Written work
Discuss the meanings of the following expressions
and then write down how they affect the
environment.
CO2: Carbon dioxide. It mainly comes from
burning oil, coal and wood.
the greenhouse effect: Carbon dioxide around
the earth makes the temperature rise.
More and more carbon dioxide forms a
“blanket” around the earth. The heat from the
sun can't escape so the temperature is rising. It
causes the level of the oceans to rise and the
climate of the earth to change.
Group work
Are you a green person? Do you want to know how
many people are turning green in your class? Work
with your partners and design a questionnaire(问卷
调查) like this.
How many kinds of pollution do you know?
…
Useful expressions
… people have cut down millions of trees.
… the earth is taken away.
The heat from the sun can’t escape so the
temperature is rising.
It causes the level of the oceans to rise …
Bye-bye!