Associated Press: The Obama administration’s chief climate negotatior says the United States is not likely to enter into a new international treaty to reduce the emissions blamed for global warming without China and other major greenhouse-gas emitters on board. U.S. climate envoy Todd Stern told reporters in a conference call Wednesday that China and other major developing countries are critical to making any international agreement work. He also said the U.S. would not race forward on a new treaty if …