Did he just say "stop immigration" as one of the ways to get zero population growth? Maybe he thinks the browns will starve if they can't get to the promised land.
I was baffled by that as well until I realized he is only concerned with town planning for Boulder, Colorado. I like to see people find practical applications for their ideas but really this poor guy has gotten way too excited by the need for building extra sewage works.
Yeah, if you told this guy in the year 1300 people would have 100+ books each he tell you it was impossible because you would have to have 19 scribes sitting on your kidney.