There is about a 70 year lag yes. But in certain areas the trend does not slow down. And there are absolutely no population growth models that show a population less or equal to the current population for a 50 or 100 year progression. Most population growth models show that by 2050 there will be between 9 billion to 11 billion people on the planet. And each person's consumption will be higher than in the previous generations too.
But nature always fixes the problem. It happens all the time in wild animal populations. It has happened all the time on island populations too. If the population doesn't correct themselves, the sustainability limits of nature will correct it for you... by starvation of food and resources. And no, a god will not save you.
The consumption wants of each person increases. So this urbanization effect of less children per household does not cancel out the fact of urbanization and consumption needs. Because each person will want/need more, but of course there will be less.
It is like a blanket. I'm sure many of you have heard of the "traction blanket" referring to the amount of traction your tires have at a time... that is why you can't brake hard and turn hard at the same time.
We all can't live with high standards and a high population. It is impossible. Unless you figure out a way to colonize space and live on it the same way we live on Earth.
Now back to this god concept?
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