Guess the meanings of the following words.

• deoxygenation removing oxygen from something.
• depopulation reducing the population of an area.
• devaluation reducing the value of something.

Lesson 1: Our natural resources

A. Match these words from the text on page 74 of the Student’s Book with their definitions.

1. efficiently
2. essential
3. logging
4. wisely

B. Read the texts again and answer the questions.

1. Why are natural resources essential to human life?
Because we use them for many things, such as food, water and energy.

2. What is the difference between a renewable and a nonrenewable resource?
Renewable resources don’t disappear when they are used. Nonrenewable resources will eventually disappear.

3. Find two examples of a renewable resource in the text and one example of a nonrenewable resource.
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4. How do greenhouse gases harm the environment?
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5. What is deforestation? How does the text say that deforestation harms the environment?
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C. Guess the meanings of the following words.

• deoxygenation removing oxygen from something.
• depopulation reducing the population of an area.
• devaluation reducing the value of something.