Yale Environment 360: U.S. Climate Change Envoy Todd Stern The negotiating architecture that has governed the decades-long pursuit of an international climate agreement is outdated, said Todd Stern, the U.S. special envoy for climate change at the State Department and the nations lead climate negotiator. In remarks delivered at Yale Universitys Law School on Tuesday, Stern reiterated the U.S. position that all nations -- both rich ones and developing ones -- must be brought together under one agreement that includes...