The major theme of this piece would be that we must take care of the nature not only to preserve it for future generations, but to pay it back for all it has done for us as well. I think that the underlying tone of this piece was very angry or frustrated at the general population for completely taking the environment for granted. She sounded like she was scolding the people for allowing this to happen. It took the "we need to maintain our environment for future generations" political position, and made it more of a "we need to respect the environment for what it has given us".