I think for anybody reading the book they're going to get an idea in their heads of all those characters, and I think that once that gets fixed, it's quite hard to shake.
But as population became denser, the natural chemical and biological recycling processes became overloaded, calling for a redefinition of property rights.
I wouldn't consciously pursue trying to make something for the charts. It's just not in my scope now. I'd rather stick needles in my eyes.