Clean power

What's in the lesson

1. 1Warm-up
2. 2In this lesson
3. 3Guess the words (1)Vocabulary exercise
4. 4Guess the words (2)Vocabulary exercise
5. 5Check the wordsVocabulary
6. 6Reading: power from natureReading comprehension
7. 7Listen: four countriesListening comprehension
8. 8Use the new wordsVocabulary exercise
9. 9What does it mean?Grammar exercise
10. 10Find the verbsGrammar exercise
11. 11if and unlessGrammar rule
12. 12Facts about the worldGrammar exercise
13. 13if or unless?Grammar exercise
14. 14What happens if…?Speaking practice
15. 15Say it naturallySpeaking practice
16. 16Council meeting: a new energy planSpeaking practice
17. 17Let's discussDiscussion
18. 18Wrap-up

Homework

1. 1Homework: word formsVocabulary exercise
2. 2Homework: your sentencesVocabulary exercise
3. 3Homework: find the mistakeGrammar exercise
4. 4Homework: an energy guideDiscussion

Words

• renewable/rɪˈnuːəbl/

  replaced by nature, so it does not run out

• fossil fuel/ˈfɑːsl ˌfjuːəl/

  coal, oil or gas, formed in the ground from plants and animals that lived millions of years ago

• pollute/pəˈluːt/

  to make air, water or land dirty and harmful

• atmosphere/ˈætməsfɪr/

  the layer of gases around the earth

• run out of/ˌrʌn ˈaʊt əv/

  to use all of something, so that none is left

• generate/ˈdʒenəreɪt/

  to produce energy or electricity

• solar/ˈsoʊlər/

  from the sun, or using the energy of the sun

• turbine/ˈtɜːrbaɪn/

  a machine with blades that turn to produce electricity

• store/stɔːr/

  to keep something so that you can use it later

• rely on/rɪˈlaɪ ɑːn/

  to need something and depend on it

Two slides from the lesson

Warm-up

Let's talk about energy.

1. Why is the air in the countryside usually cleaner than the air in big cities?
2. Are electric cars popular where you live? Would you buy one?
3. Have you ever seen a wind farm or solar panels near your home? What do you think of them?

Grammar rule

if and unless

Facts that are always true

If + present simple, present simple

• If the wind blows, the blades turn.
• If you heat water to 212°F (100°C), it boils.

The if-part can come second, without a comma: A turbine stops if the wind is too strong.

unless = if … not

Unless the wind blows, turbines don't produce anything. = If the wind doesn't blow, turbines don't produce anything.

Unless already means if … not, so don't add another not: unless it rains, not unless it doesn't rain.

Always true, or one situation?

If you heat ice, it melts. (every time) · If it's sunny tomorrow, we'll go to the beach. (one situation in the future)