TO GO WITH STORY BY MARY SIBIERSKI (FILES) This picture taken on February 12, 2013 shows a smog over Krakow, Poland. The thick, grey layer of smog blanketing Poland's southern city of Krakow is one of the most visible symptoms of the EU member's addiction to coal, a habit experts warn is both economically risky and deadly. AFP PHOTO / BARTOSZ SIEDLIK / AFP PHOTO / BARTOSZ SIEDLIK