I can't imagine maintaining that in anything other than a brutal and arbitrary way. It's very difficult to separate humans from their humanity, and even in countries where birth limits have been tried, we know that it is an ineffective policy and is ultimately cruel.

> Clean, abundant, and without the catastrophic extinction event already underway.

Just take your ideas one step further. Earth is not a home for humans, it is a crucible that seeks to find the most suitable form of life. There's no reason we should expect to succeed, and if we can't, half-measures that only prolong suffering and the failure of our biology are illogical.