Reuters: The prospect of a global climate treaty is fading as the world’s top two carbon emitters, China and the United States, avoid legally binding action. Experts say a shift to a less ambitious goal might help. Less focus on a new treaty might resolve a tangle of disputes over the legal framework and drive concrete action, for example to preserve rainforests or to help developing nations cope with droughts, heatwaves, floods or rising seas. U.N. climate talks to try to agree a …