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Module
4 C C LI L
LI
L
CLIL Science

A. Discuss.
• Do you think it’s important to protect the environment?
• What do you do to protect the environment?

B. Why do you think people install
gardens on their roofs? GREEN ROOFS

Read and find out.
The hanging gardens of Babylon were one of the seven wonders of the
ancient world. It’s unknown what they looked like, but they were probably
© MM Publications
some kind of rooftop gardens. In the modern world, green roofs are
environmentally friendly and are becoming very popular in cities. So, it
seems the ancient Babylonians were eco-friendly too.

A green roof works well in all seasons. In summer, it keeps the temperature low
in the house and in winter, it keeps the heat inside and warms up the house.
Also, green roofs absorb rain very well and help prevent flooding. A green roof
can also make a roof much nicer to look at. There are two types of green roofs:
intensive and extensive.
Intensive roofs
These are like normal gardens but on your roof. You can have flowers, bushes
or even trees. However, they often include more than 15 cm of soil and aren’t
suitable for most buildings. They need big buildings with strong roofs that can
take the weight of all the soil and plants. They aren’t easy to look after, but they
can be very attractive.
Extensive roofs
These roof gardens have grass and don’t need much soil. You can install them
on any roof and there’s a great variety of grasses that you can use. Plants that
you find on cliffs survive very well too. Extensive roofs are more common than
intensive roofs and they’re easier to look after.

Green roofs can be expensive, but they are worth it. Just think of the many
advantages for your home and for the environment, especially in major
cities. Imagine looking out from one of the modern wonders of the world,
the Empire State Building, and seeing a sea of green rooftops. That’s what
cities should be like.

C. Read again and answer the questions.
1. According to the text, why were the ancient PROJECT
Babylonians eco-friendly? Do research!
2. Why is a house with a green roof useful in winter?
3. On what kind of green roof can you have trees? Search the Internet and find other ways to
4. What kind of buildings can have intensive roofs? make your house eco-friendly and to protect the
5. Where can you install an extensive roof? environment. Write a text presenting those you
consider most important. Explain why you consider
6. What are the best kinds of plants for extensive them important and present your ideas to the class.
roofs?

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