Exercise 17. Answer the following questions

1. What has human progress reached? 2. How is man affecting the environment? 3. What is becoming increasingly clear? 4. What must people take into account? 5. Why is the biosphere changing? 6. When did not material production require taking into account the consequences of man's interference in nature? 7. What happened in the second half of the 20th century? 8. What should man carefully study? 9. What has a disastrous effect on man? 10. Is ecological problem simply the problem of environmental pollution? 11. What does the biosphere possess as a complex system? 12. What is the impact of industry on the biosphere compensated by? 13. What do many ecologists consider? 14. What do the world's famous biologists warn? 15. When will the world environment change irreversibly?

Exercise 18. Read the text once more and find phrases concerning the negative influence of men's activity on biosphere.

Exercise 19. Retell the text "Man and environment".

Exercise 20. Discuss the following problems:

1. What is the main problem of ecology?

2. What is the difference in points of view on nature: -in 19th century?

- at the beginning of the 20th century?

- in the second part of the 20th century?

- at the beginning of the 21st century?

UNIT 6 Society and Nature Exercise 1. Before reading the text memorize words and word