22 April 1915 marked the first large scale introduction of chemical weapons in warfare, when chlorine gas was released into enemy trenches near Ypres, Belgium. Since that time many hundreds of thousands of people have been killed or injured by chemical weapons. As recently as 2012, chemical weapons were used in the current Syrian conflict. 100 years after the first use, on 21 April 2015, Ambassadors to the Organisation for the Prohibition of Chemical Weapons (OPCW) gathered in Ypres to commemorate those who have died as a result of these awful agents, to present a commemorative plaque to the town of Ypres, to reveal a new declaration on chemi...