answer: #Person1# thinks people should grow more trees to stop the sandstorm while #Person2# thinks people should stop cutting down trees.
documents: #Person1#: There will be another sandstorm here tomorrow. 
  #Person2#: It's the fourth one this year. Isn't it horrible. 
  #Person1#: Yes. We should plant more trees and grass to stop the sand from spreading. 
  #Person2#: It may take many years for the trees to grow. I hope people will stop cutting down trees. 
  #Person1#: But we need the wood. 
  #Person2#: But we can't destroy our forests to get the wood.