Two years ago, an international scientific panel seized worldwide attention by reporting that human activity was warming the planet in ways that could greatly disrupt human affairs and nature. Skip to next paragraph Dot Earth Andrew C. Revkin blogs about climate and sustainability. Can a prize-winning climate panel move from fame to efficacy? Join the discussion. Enlarge This Image Charlie Riedel/Associated Press DAUNTING TASK A smokestack near Emmitt, Kan. Talks on a new climate treaty remain deadlocked. The work of the group, the Intergovernmental Panel on Climate Change, shared the 2007 Nobel Peace Prize with former Vice President Al Gore.