Synthesized answer
The provided passage does not contain information about unanswered questions within the "Quiet Movement" or any other context. Therefore, it is not possible to answer what questions remain unanswered based on this passage alone.
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