Reuters: Official Washington sounded more upbeat on Monday than it has for weeks in sizing up U.S. President Barack Obama’s chances of progress on a climate-change bill in Congress this year. U.S. Senator Barbara Boxer predicted the committee she leads would approve a bill before a U.N. climate summit in Copenhagen in December while Obama’s Energy Secretary Steven Chu said he hoped all of Congress would pass a law by then. Their positive comments contrasted with those of Carol Browner, …