answer: #Person1# think air pollution is the biggest environmental problem in #Person1#'s country. #Person1# and #Person2# agree that there needs to be an international response to this problem.
documents: #Person1#: I think the biggest environment problem in my country is air pollution.
  #Person2#: Yes, I agree. The air here is much more polluted than in my country. Of course, my country is more agricultural and has much less industry.
  #Person1#: We have reduced emission of air pollutants in recent years, but cars are still a major source of them. Factories have become cleaner as stricter environment pollution law have been introduced.
  #Person2#: The problem is now on a truly global scale. I don't believe that any single country can do anything about it.
  #Person1#: I think you're right. There needs to be an international response to this problem?