Brussels, 06/06/2011 (Agence Europe) - On an official visit to Paris on Friday 3 June, the Polish prime minister, Donald Tusk, was assured by the French president, Nicolas Sarkozy, that France would not call for an EU ban on Poland's plans to use its vast reserves of schist gas (5,300 billion cubic metres) (a controversial issue in France). Poland aims to make speedy use of its gas to reduce its reliance on supplies from Russia. On Friday, Sarkozy told Tusk that he was aware that schist gas...