Reuters: The Bush administration’s environment policy chief sounded optimistic on Thursday about U.S.-hosted climate change talks, noting a mood shift among the world’s biggest greenhouse polluting countries. In contrast to grumbling at the fringes of the first U.S.-sponsored conference on the issue in September, representatives of 17 major economies at the Hawaii meeting are now ready to talk about specific things to do to combat climate change, said James Connaughton, head of the White House …