answer: #Person2# thinks people need to do more, like using public transportation, using renewable energy, and recycling, to prevent more damages from happening so that the earth can continue to be a habitable place. #Person1# is surprised by #Person2#'s expertise.
documents: #Person1#: What did you do over the weekend? 
  #Person2#: I went a global warming rally. It was fantastic to be around so many people who care about the environment. 
  #Person1#: Do you think there's anything we can do to reverse the damage that's been done already? 
  #Person2#: It might not be possible to fix the problems that we've created for ourselves, but there are lots of things we can do to prevent more damages from happening. 
  #Person1#: Like what? 
  #Person2#: Well, we can use public transport instead of taking our cars for a start. 
  #Person1#: What else can we do to protect the environment? 
  #Person2#: If you do have to drive, you should make sure that your car runs on unleaded petrol. Also, your home should use sources of renewable energy. 
  #Person1#: How about recycling? Does that actually help? 
  #Person2#: Yes. You should take your glass, paper, plastic, cardboard, and tin cans to a recycling center. 
  #Person1#: What do you think the biggest worry for our future is? 
  #Person2#: I think that the issue of greatest concern is having enough sources of clean water for everyone. 
  #Person1#: I had no idea you were such an environmentalist before! 
  #Person2#: To be honest, in order for the earth to continue to be a habitable place, we're all going to have to become more interested in the environment.