[eveningcoffee]

I am sorry.

I did not mean that children should personally take care of me. Rather they will provide to the economy and this will keep the system running. If everybody is busy dying then not much is left for other activities.

What I mean by sustainable society is that it can keep its populace in constant size on its own.

India is not sustainable, Arab countries are not sustainable. But so are also not most European countries because they need heavy immigration to maintain the population size.