Synthesized answer
The provided passages do not contain information about what questions remain unanswered in "The Overstory." The passages describe the book's plot and themes, introducing characters and their connections to trees, as well as hinting at a larger environmental catastrophe [Passage 1]. However, they do not detail any specific questions that are left unresolved by the narrative.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The Overstory by Richard Powers Description: *The Overstory* unfolds in concentric rings of interlocking fable that range from antebellum New York to the late-twentieth-century Timber Wars of the Pacific Northwest and beyond. An Air Force loadmaster in the Vietnam War is shot out of the sky, then saved by falling into a banyan. An artist inherits a hundred years of photographic portraits, all of the same doomed American chestnut. A hard-partying undergraduate in the late 1980s electrocutes herself, dies, and is sent back into life by creatures of air and light. A hearing- and…