Sorry. It won't work. As far as I am concerned the world is divided by those doing the right thing and those caught up in some religious belief that allows them to continue to do the wrong thing when it comes to our planet. Those generally pushing for this One World Government are either naive idealists or those that cannot come to grips with the problems of human overpopulation.
Countries such as Japan, mainland China, France, Britain, USA, Australia, New Zealand, Finland, Belgium etc are doing the right thing and are expected to carry the can (make up for) the people of this world intent on doing the wrong thing.
Education may convince some of the wrong doers in time to change sides but until all the wrong doers toe the line I think One World Government a really bad idea.