Reuters: The United States is at odds with China and other developing nations by favouring a Copenhagen climate accord as the blueprint in 2010 for a stronger deal to fight global warming, documents showed on Wednesday. In a sign of hurdles ahead, developing nations are instead stressing U.N. texts worked out since 2007 to guide talks after the Copenhagen climate summit in December disappointed many nations by failing to agree a legally binding treaty. A 5-page U.S. document outlining …