Hi Nepalilaure,
the converse is also true though. If everyone start NOT thinking like me and gyanguru, then there will be an oversupply of kids. And there is already an oversupply. I am not suggesting adoption as an alternative to having kids but rather the idea of having a kid, whether adopted or blood related need not be fancied by all. There are no written rules that everyone MUST have a kid. There is freedom of choice. And these days it is economical not to have children. If one explores the reasons, even if you are super rich and your wealth can sustain future generations it still can make civic sense not to have children. At times, it can make moral sense. I love kids too. I have donated to charities what i can afford to help kids in poor countries. There are other things we can do to show our love. And we will be doing mother Earth a favour also. It is funny you suggested if everyone adopts then parents might be deprived. Do you even realise how many orphans are out there?  Of course there will always be people reproducing, it is not rocket science you know.