Explain why an ecological problem a social one is

Explain the meaning of the word “ecosystem”.

9. Using the data from the text, tell about the possible consequences:

A)accumulation in the atmosphere carbon dioxide and aerosols; b) the flight of supersonic aircraft.

Tell what new information from the text you have got.

Explain your understanding the title of the text.

Lesson 70

The following sentences are first, second,or third conditional. Put the verbs in brackets into the appropriate form.

1. We wanted to go out yesterday but the ewather was terrible. If it had been (be) a nice day, we would have gone (go) for a picnic.

2. Why don’t you explain everything to him? If you...(not tell) him the truth, I’m sure you...(regret) it one day. 3. Jennifer was here not long ago. If you...(come round) earlier, you...(see) her. 4. Apparent, the ferry company are planning to close the port in this town. If that... (happen), the town... (lose) a great deal of money. 5. I...(help) you with it if I...(have) more time but I’m afraid I haven’t got any spare time at all at the moment. 6. The government is expesting to win the next election, but if it...(lose), the Prime Minister... (resign) from politics. 7. I am so glad that you took me to your friend’s party. If we... (not go) there, I...(never meet) Adrian. 8. It’s ridiculous that trains are so expensive. If fares...(be) cheaper, I’m sure more people...(use) the train and leave their cars at home.9. If she...(get) that job she’s applied for, she...(be) delighted. And think she’s got a good chance of getting it. 10. Fortunately the explosion took place at night when the streets were empty. It... (be) a disaster if it...(happen) in the middle of the day. 11. The talks between the two leaders keep breaking down. If they...(break down) again, it is possible that there...(be) a war between the two countries. 12. If Alison...(know) anything about car mechanics, I’m sure she...(help) us fix the car, but I think she knows even less than we do. 13. They’ve been married for twenty years now but I don;t think she...(marry) him if she...(know) what a selfish man he was. 14. Children spend too much time watching television and playing computer games. I’m sure they... (be) happier if they... (spend) more time playing outside.