Your mixing logic between the issue of a "one world" and a solution that lays in the conceptual boundaries of nationhood.

A world green police sounds great (better than a world oil reserve police atleast) but that requires a world government to come up with the authority and solution that does not result in suffering.

It's not going to work if the country you live in is secluded from the world and is exploiting the resources of the world for the commodities and relative fortune.

Ignoring the very concept of countries and sovereignty will not help fix the current situation.

I understand people are disillusioned with politicians everywhere in the world but we should not abandon politics because of that.