Well…two photographs, actually. I remember seeing a downright shocking before-and-after shot of the exact same piece of desert, with and without saguaro cactus. I seem to remember that the problem was that people were stealing them out of the desert (that practice has since been deemed illegal).
I don’t remember if it was in Arizona Highways or somewhere else, but I tried to find them and had no luck. I’m not even sure how to word the search. So… if anyone can find those shots, I’d be most appreciative.