our planet Earth

ffer from - страдать от чего-либо
oxygen balance - баланс кислорода
destruction - разрушение
ozone layer - озоновый слой
careless interaction - легкомысленное взаимодействие
sign - знак
Since ancient times Nature has served Man, being the source of his life. For thousands of years people lived in harmony with environment and it seemed to them that natural riches were unlimited. But with the development of civilization mans interference in nature began to increase.
Large cities with thousands of smoky industrial enterprises appear all over the world today. The by-products of their activity pollute the air we breathe, the water we drink, the land we grow grain and vegetables on.
Every year world industry pollutes the atmosphere with about 1000 million tons of dust and other harmful substances. Many cities suffer from smog. Vast forests are cut and burn in fire. Their disappearance upsets the oxygen balance. As a result some rare species of animals, birds, fish and plants disappear forever, a number of rivers and lakes dry up.
The pollution of air and the worlds ocean, destruction of the ozone layer is the result of mans careless interaction with nature, a sign of the ecological crises.
Questions:
1. Who has served nature since ancient times?
2. What did people live in harmony for thousands of years with?
3. What pollutes the air we breathe, the water we drink, the land we grow grain and vegetables on?
4. What is cut and burnt in fire?
5. What do man many cities suffer from?
Statements:
1. Since ancient times Nature hasnt served Man
2. Natural riches are unlimited
3. The by-products of their activity clean the air we breathe, the water we drink, the land we grow grain and vegetables on