answer: #Person1# and #Person2# talk about environmental changes. #Person1# says trees have been cut down and animals have left.
documents: #Person1#: It's terrible how things have changed. You remember there used to be trees on all these hills.
  #Person2#: Really? There aren't many left now.
  #Person1#: No, they've all been cut down and now all the soil is washing away.
  #Person2#: Were there any animals in the forest?
  #Person1#: Yes, I can remember it very well that there used to be all sorts of animals and birds. But nowadays you just don't see the birds that you used to see around here.