Synthesized answer
The provided passages do not offer enough information to answer the question about the evidence the author provides. The only passage available is the title of a book [1]. To determine the evidence presented by the author, the content of the book itself would be required.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The quiet revolution: grass roots of today's wilderness preservation movement by Donald N. Baldwin