answer: The biggest issue in #Person2#'s country is water so their water is used in ration. The biggest environmental problem in #Person1#'s country is air pollution. They think there needs to be an international response to this problem.
documents: #Person1#: Is the environment a big issues in your country? It is in mine.
  #Person2#: It is in mine too. The biggest issue is water. The climate is dry and so water conservation is very important.
  #Person1#: What methods do you use to conserve water?
  #Person2#: Water is rationed. We can only use a certain amount each month. It means that we cannot use some modern household items, like washing machines. They use too much water.
  #Person1#: I see. 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.