Reuters: Skiers including Olympic gold medalists appealed on Friday to U.N. climate talks in Poland to do more to slow global warming to help keep snow racers in business. Several Polish skiers and snowboarders slid down a ramp covered by snow trucked in by the WWF environmental group and handed a petition to Polish Environment Minister Macjiec Nowicki in Poznan, hosting December 1-12 U.N. talks on a new climate treaty. “Ice and snow are particularly vulnerable to the impacts of global …