At a closed-door retreat in a Long Island mansion late last October, United Nations Secretary General Ban Ki-moon and his topmost aides

At a closed-door retreat in a Long Island mansion late last October, United Nations Secretary General Ban Ki-moon and his topmost aides brainstormed about how the global organization could benefit from a "unique opportunity" to reshape the world, starting with the Rio + 20 Summit on Sustainable Development, which takes place in Brazil in June.