BELCHATOW, Poland — They call it Poland’s biggest hole in the ground. The coal mine here is more than eight-and-a-half miles long, nearly two miles wide and as deep in parts as three football fields. Enough coal comes out of it to fuel Europe’s largest coal-fired utility plant, whose chimneys loom in the distance. “The entire world population could fit in this hole,” Tomasz Tarnowski, an administrator here, said in a bit of proud hyperbole as he led a group of reporters on a walk near a towering mound of brown coal about halfway into the mine. Poland is Europe’s coal colossus. More than 88 percent of its electricity comes from coal. Belchatow is one of its huge sources and the largest carbon emitter in Europe. (There’s no “belch” in Belchatow — it is pronounced bel-HOT-oof.) This month, a United Nations conference on climate change will be held in […]