I read an interesting novel recently called “The Abominable” that discsused a lot of this stuff in relation to climbing Everest in the late 1930s/early 1940s.
I won’t recommend the novel because the Abominable wasn’t a yeti, it was human behavior that I didn’t need to read about. I won’t spoil it more in case you decide to read it anyway. The fact that it wasn’t about Yeti was in the jacket flap.
Americans seem to have a tendency to drop their trash anywhere. I think there was also a book about “The Ugly American,” but I was young enough that it held no interest for me. However, I’ve seen enough “trashy” people to always be mindful of what I do with the trash I generate.