United Nations officials have been hoping the U.S. under President Barack Obama would not only join a new agreement, but also help lead the way for others to participate. "Secretary General [Ban Ki-moon] sees U.S. engagement as vital for a climate change deal ... He stated that we cannot afford another period where the U.S. stands on the sidelines." But enthusiasm about U.S. involvement has begun to wane, as the Obama administration has made health care a priority. Full Article at CBC News