He didn't say that one shouldn't have kids due to environmental impact, he was just putting it in perspective. The point was that if you have kids, and if you don't worry about the environmental impact they cause, then you shouldn't worry about the much smaller impact of a Raspberry Pi either.

There's no need to keep the population growing as it is though. That's unsustainable. It's not all or nothing: make as many kids as possible or go extinct. There's a middle road.

It would be great if humanity would shrink to 1 or 2 billion. More than enough. Resources wouldn't be as scarce, housing wouldn't be a problem. Much less need for wars as most of those are driven by resource and land scarcity. It would be much easier to reach an equilibrium with nature.

The problem is that a high birth rate is viewed as a virtue due to religious and short-term budget concerns (more people to pay for pensions etc). While it's true that a shrinking humanity would cause temporary issues, it would only be for a while until it stabilises.

I for one am really happy with my decision of not having any kids.

I don't frown on people with 1 or 2 kids but I do on those with huge families. But that's just me, they are free to do so of course.

That's not what I said at all!

I said if you have kids don't hand wring over your environmental impact. It's like thinking that if you cry at the beach you're making the ocean saltier.

If you have kids you're betting that, "the best contribution is to bring up a well adjusted, kind and capable individual, and for them to do the same."

It's a decent bet for sure.