I don't know about one world government, but there is definitely a push for a global social democracy. This is the actual goal of the current UN and our own administration, and they were hoping to use global warming to finance it. I don't believe, however, that the UN actually foresees a central world government but rather a world where individual governments are constrained by treaties into redistributing the world's wealth at a cost of 6% administered through Algore and the UN.
Those of you who rightfully say that a treaty is inferior to our own constitution and even our own legislation, need only fear the Treasury Department. There is no legal constraints on the US making loans and forgiving those loans, nor is it illegal for the Treasury to issue bonds to fund foreign programs. Don't think that Obama isn't aware of this either.