...I have no idea what you're talking about.

Uh here you can't make kids by magic but to make them the normal way you have to buy a credit. 

That is not a thing where I'm from. And normally we don't make kids by magic either, this has been a very unusual day.

I guess if your magic can make enough space? Sounds nice.

Make enough space?

For all the people to live.

We haven't run out of planet yet.

Oh, I guess that'd work too. Ladah is wiggling. He sets him down, murmurs something. 

China's doing population controls, but nobody else is, yet.

In our world once a few places started then they got worried about their neighbors running out of space and overrunning them and there were preemptive wars and - lots of wars - and then eventually everyone agreed on treaties about growth rate and now they mostly all stick to it.

Yikes. No, that hasn't happened to us.

Probably will, though. Unless you just get it together with the treaty in the first place. He sits down heavily.

What was the population when this happened?

I think we started worrying around six billion? But we might have different land area. There are thirteen billion of us now.

We've got seven billion and I don't think anyone's seriously worrying...in fact, I think Japan's below replacement rate.

That's weird. 

Why?

Even the population that is horribly mistreated and that everyone's probably going to murder pretty soon has kids. I can't imagine any conditions that'd get us to have kids below replacement without population controls.

I guess it must be an alien thing.

I guess. We figured everyone'd be like that, because of evolution.

I think evolution didn't anticipate birth control.

I guess that'd work on species that don't actually want kids.

A lot of us do. I do. Just not all of us.

I think that then in a couple generations all of you will. But I could be wrong.

Maybe. Who knows? Anyway, if it gets too bad we'll figure out how to terraform Mars or something.