New York Times: At the start of the United Nations climate talks here 12 days ago, the Obama administration’s chief climate negotiator, Todd Stern, received a round of rowdy applause. It was the first appearance of the new negotiating team at any global meeting. But by Wednesday, as the meetings drew to a close, some delegates – and even some United Nations officials – were grumbling that the United States was not moving fast enough to take action on global warming. On Wednesday, Mr. Stern’s …