No, no, no. Cloning, Darfur, Food for Oil, none of it is important. What's really important is Kyoto. There, that's what they should be dealing with.
Without universal ratification (at least amongst developed nations) a cloning ban would be a fool's errand. It would merely better identify where research money will flow and nothing more. Any nation that would ratify the treaty can just as easily pass a domestic statute that bans cloning for the same result.