Reuters: Poland, one of the heaviest polluters in Europe, will become even dirtier now that its shale gas ambitions have faded and it turns to cheap domestic lignite coal to secure its energy supply. Poland already relies on coal to produce more than 90 percent of its electricity and is home to the European installation that emits the most carbon dioxide - utility PGE's lignite power plant in Belchatow. Its choice of fuel now could determine its energy and environmental situation for decades to come, given...