Population Control: Let's consider it

[A Black Falcon]

birth control will not do any good, If the culture firmly rejects it on religious grounds.

Sure, but this is only a problem in certain places, and it is one that can be overcome.

Those who do not reproduce get replaced by those who do, There is a good chance the fading society will not pass on their culture to the new comers.

Are you referring to the "do immigrants become part of the culture of the nation they join?" issue? In America at least, proof is that they do. In nations where nation means only one specific ethnic group, however, that is admittedly much less certain.

Until the day we can have genetically engineered humans with 300 year lifespans, I wouldn't go over board sterilizing populations, We will still need to replace the old with the new.

What... huh? Who suggested that?

The first world only breaks even ,In some places like Spain their is more coffins then cradles coming out.

I know, that was one of my points. Europe is shrinking overall; only the third world is growing.

That's the irony, really. Or the tragedy of it, more like. The nations that can most afford to deal with the problems of growing populations and the challenges of global warming and the strains of what is perhaps peak oil have mostly steady or decreasing populations, while the nations that can least afford it are growing, rapidly. It's really a recipe for disaster, sadly...