Chicago Tribune: Rajendra Pachauri isn’t nearly as famous as Al Gore, who shared the Nobel Peace Prize with an international panel on climate change that Pachauri, an Indian scientist and economist, has led since 2002. But as chairman of the UN’s Intergovernmental Panel on Climate Change, Pachauri has an urgent message for world leaders about the perils of global warming. He talked to the Tribune recently while he was in town to meet with Mayor Richard Daley and Chicago civic leaders. An edited …