Computers project that between now and the year of 2030 we are going to have increase of the average temperature between 1,5—4,5 Degrees C. Sea levels would rise by several metres, flooding coastal areas and ruining vast tracts of farmland. Huge areas would be infertile and become uninhabitable. Water contamination could lead to shortages of safe drinking water. It looks like the end of civilization on the Earth. For hundreds of thousands of years the human race has thriven in Earth's environment.
But now, at the end of the 20th century, we are at a crucial turning point. We have upset nature's sensitive equilibrium releasing harmful substances into the air, polluting rivers and oceans with industrial waste and tearing up the countryside to accommodate our rubbish. These are the consequences of the development of civilization. We are to stop it by joint efforts of all the people of the world. The range of environmental problems is wide.
l. The rule was explained to the students by the teacher.
2. He is often laughed at by them.
3. He was being listened to by nobody.
4. The successful performance of the young actress will be talked much about by people.
5. You can't watch the film now. The film cannot be watched now by you. The TV set is being fixed by the mechanic.
6. All the advertisements were looked through very attentively by us.
7. The house has been repaired lately by John.
8. All the business letters will have been answered by noon by me.
9. Is the floor being washed by her? No, she has already washed it.
10 The birthdays have been celebrated recently by my schoolmates.