Have you noticed that in all the doomsday pronatalist propaganda about the falling birth rates that they NEVER mention carrying capacity. I realize that it's hard to do when we don't have a solid answer...and yet don't we? That quote about how excessive Americans live - so much so that we could only be 2 billion if we all lived that way - is a clear indicator. And here we are with major newspapers screaming that the sky is falling because if we don't keep making new people, our economies will collapse. Yes, as if that's going to matter when the earth is no longer hospitable.