Everyone knows what happens in china, they only can have one child and they only want boys so you can always adopt chinese grils. I think it is inefective, the whole world would have to chip in for it to work, if one country is controling their population it just puts the extra population on other contries. I believe for it to work a strong grip has to be placed on the majority of countries and limit families to two childern. Nothing will ever happen like this so really the only thing thats going to limit the population is starvation and\or war, which is really sad.
visit china and you'll see ... the cities are really dense ... they could move lots of people to the vast hinterlands but it's been tried and apparently was not very successful, the population density is still on the coasts.
don't know re india and indonesia, think they have been trying birth control for quite a while.
re the USA, i thought the birth rate was going down as affluence increases, so why the need?