The film's title has three meanings according to the closing credits. They are (1) a life of killing each other (2) war as a way of life and (3) civilized violence (interpretation).
All identifiable material seems to originate in 4/3 aspect ratio.
It seems an artistic choice to render them in "wrong" 16/9, just like the frequent negative filming.
This film is part of the Criterion Collection, spine #642.
According to the end credits, the title is pronounced nah-koy-kahtsee.
The word "Naqoyqatsi" is a noun from the Hopi language literally meaning "each other-kill many-life", as stated in the film's end roll.