Reuters: Greenpeace protesters clashed with coal miners at a new opencast mine on Monday in an incident highlighting Poland’s environmental dilemma on the eve of a major U.N.-led conference on climate change. The western Polish city of Poznan will be the venue for the December 1-12 conference aimed at agreeing a new global climate package to replace the Kyoto protocol which expires in 2012. But Poland still relies on polluting coal for more than 90 percent of its growing energy needs. …