文档介绍：Unit 2 Saving the Earth
Topic2 All these problems are very serious.
Section C
加田中学 李秀群
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
fewer trees
factory pollution
traffic pollution
the ozone layer
more carbon dioxide
Can you match them?
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?
Read and understand
（flash）
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.
_________ 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.
Fewer Trees
____________ In big cities, cars and buses have polluted the air. Many people in cities now have health problems.
_____________Factories have also polluted the land and the water. As a result, many rivers and lakes are now dead.
_____________ 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.
Traffic Pollution
Factory Pollution
The Ozone Layer
________________ Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil,