1.  What is the main issue in dialogue #1?

  Increase in skin cancer.
  Pollution in the air.
  Thinning of the ozone layer.

2.  What can be done to solve problem #1?

  Drive less.
  Avoid carpool.
  Exhaust car gases.

3.  What is the main issue in dialogue #2?

  Air pollution.
  Water pollution.
  Treated water pollution.

4.  What can be done to solve problem #2?

  Avoid drinking 100 percent pure water.
  Treat waste products more carefully.
  Destroy bacteria in drinking water.