Seventh Ministerial Conference "Environment For Europe" Astana, Kazakhstan, 21-23 September 2011 Sixth Ministerial Conference "Environment For Europe" Belgrade, Serbia, 10-12 October 2007 Fifth Ministerial Conference "Environment For Europe" Kiev, Ukraine, 21-23 May 2003 Fourth Ministerial Conference "Environment For Europe" Aarhus, Denmark, 23-25 June 1998 Third Ministerial Conference "Environment for Europe" Sofia, 23 - 25 October 1995 Second Ministerial Conference "Environment for Europe" Lucerne, 28 - 30 April 1993 First Ministerial Conference "Environment for Europe" Dobris Castle, 21 - 23 June 1991