Reuters: The United States is making progress with China on outstanding issues overshadowing U.N. climate talks but cannot say whether a deal will result after President Barack Obama arrives in Copenhagen, officials said. Obama left Washington later on Thursday and is due to arrive in Denmark around 8:30 a.m. local time on Friday, U.S. officials told reporters on a conference call. He will give a brief address at a plenary session with other world leaders and emphasize the renewed U.S. …