Which excerpt from "The Damnation of a Canyon" is an example of an ad hominem fallacy?

An ad hominem fallacy occurs when someone attacks the character or circumstances of an individual making an argument rather than addressing the argument itself.

To find an excerpt that showcases this, look for sections where the author or a character dismisses another person's viewpoint based on personal traits or past actions rather than the merits of their arguments.

Since I don't have direct access to the text of "The Damnation of a Canyon," I recommend examining the passages where critiques are leveled at individuals instead of their ideas or propositions related to the canyon or environmental issues. Look for phrases that undermine a speaker's credibility based solely on personal characteristics rather than their actual points being discussed.