Brussels, 10/04/2012 (Agence Europe) - On Friday 6 April, EU Climate Action Commissioner Connie Hedegaard tweeted that polluters must pay, even when they fly. On 5 April, the French prime minister, François Fillon, wrote an open letter to the European Commission expressing French airlines' concerns at possible retaliation by countries like China that are unhappy about the EU's ETS directive which introduced a charge on airlines using EU airports to cover 15% of the greenhouse gas emissions...