Reuters: The U.N. panel of climate scientists agreed on Thursday to change its practices in response to errors in a 2007 report, and its chairman, Rajendra Pachauri of India, dismissed suggestions he should step down. At an October 11-14 meeting in Busan, South Korea, the 130-nation panel agreed to tighten fact-checking in reports that help guide the world’s climate and energy policies and to set up a “task force” to decide on wider reforms by mid-2011. “Change and improvement are vital …