Two Billion?

[redpaintednavi]

Some scientists say that we in some way or another must reduce the population of the Earth to be able to live in a sustainable way with those resourses that exists. They also say that if we do not reduce our population Nature will some day do it for us, in a brutal way that we would not like. They say that a reasonable sustanable number of humans would be around two billion.
If this is true then we must gradually decrease our population until we reach a level that our planet can handle and where the resources will be enough for everyone.
But what is the best ways to do this? How shall we organize child and family planning in such a way? How shall we motivate people to participate in this change?
And how shall we distribute the resources of the Earth so that all people can get a fair share?