Reuters: Talks between the world’s top two carbon emitters this week did not cover new ground, U.S. climate envoy Todd Stern said, with Beijing and Washington apparently still struggling to bridge differences blocking a global deal. Stern was in Beijing as part of a delegation to the high-level China-U.S. Strategic and Economic Dialogue, and met counterparts including Xie Zhenhua, China’s top climate negotiator, and members of his team. “I don’t think new ground, I think we were working …