I think the main reason the orthodox in the Episcopal Church are so wary of the Millenium Development Goals has to do with the reverence granted them. No one is opposed to feeding the hungry, teaching the illiterate and such. But the MDG's are wholly secular. They were created by and sponsored by an organization that is wholly secular. That organization is also corrupt in a spectacular fashion.
Bad things happen when the Church gets involved with the State. For a church that used to be a state church such as TEC, the peril is greater. A good analogy might be the adulterous wife resuming an affair with the evil mustachioed banker while she is estranged from her husband. Not only is the affair wrong, but there is every chance she will sign over the deed to the ranch.
Similarly, TEC needs to keep her distance away from the UN. Certainly, do all the good works possible, but also not get drawn into the morasses the UN is prone to.
It would be far, far better to focus on God's law.