answer: #Person1# and #Person2# talk about air pollution in their countries and they call for an international response because a single country can do nothing.
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. 
  #Person1#: That's because your country is more agricultural and has much less industry. 
  #Person2#: Yeah, you are right. 
  #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 laws 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. An international response to this problem is needed.