Contemplating a one child world

A one child world1 may just be possible in China, a country of coercion, abortion, and neglect of orphans; it may also be achievable soon in Catholic Italy and Ireland. For most countries, though, the switch from demographic transition (average families of 2.1 children) to ecological transition (a one child world) is at least a generation away, and in countries threatened by or already experiencing demographic entrapment this will take much longer. The resurgence of nationalism also complicates this objective, as many ethnic groups will insist that a one child family should not apply to them.