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Page 94
No limit
I can identify the main idea in a text.
THINK! Do you need oil or coal in the future?
NOTHING TO LOSE
We use fossil fuels in our daily life, but they are limited and cause pollution. A lot of scientists are working hard to look for some lossless and environmentally friendly sources of energy.
Solar energy is not new to us because we use it to dry things every day. Solar panels catch sun rays and change them into electricity. We know that it is renewable because the sun never stops producing sunlight.
Wind power is also an old source of energy. In the past, explorers used wind for sailing their ships to distant lands. A single windmill can pump water and generate electricity. To get much more power all at once, people install lots of giant wind turbines on wind farms.
If we stop using fossil fuels, our planet will be greener. There is nothing to lose when we use solar energy or wind power.
1. Look at the pictures, then read the text quickly. What is the main idea? Circle one of the options below.
A. Fossil fuels
B. Green sources of energy
2. 🎧2.26 Listen and read the text. Complete each sentence with ONE word.
1. _________ fuels are limited, and they cause pollution.
2. Solar energy is _________ because the sun never stops producing sunlight.
3. They install giant wind _________ to get much more power all at once.
4. Our planet will be _________ if we stop using fossil fuels.
5. There is no _________ to solar energy and wind power.
3. VOCABULARY PLUS Use a dictionary to check the meaning of the words in blue in the text.
4. 
USE IT! Work in groups. Ask and answer the questions. Which do you prefer, solar energy or wind power? Why / Why not?
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