Industrial Tourism and the National Parks by Edward Abbey

What are the major themes in this piece? Are there any minor themes as well?

The minor theme is that he wants to get attention from all kind of people who want to help to stopping the the road building true the national parks.
The minor themes lead to the major theme. The whole piece is building up on emotions pathos. He is talking about all the details from his daily life to people who life there and to the things he likes and hates at the park he works.
All that gives a great connection to the park and more people are likely to help.

One thing that doesn't make sense it when he is talking how easy he has it and that he has so much time to watch the nature and can make himself a drink every once in a while. But then he complains about the lazy park rangers who dont do that they are supposed to do and they don't know what they are doing.