Resumen de Gas! gas! gas!
On a bright day in late April 2015, dignitaries gathered in the Belgian town of Ypres for a little-noticed commemoration: the hundredth anniversary of the first modern use of chemical weapons. Under a clear sky, representatives of the 1997 treaty banning such weapons reaffirmed the unacceptability of their use "anywhere, at anytime, by anyone, under any circumstances. As they spoke, there were reports that the Syrian government was dropping chlorine on civilians and ISIS was resurrecting another first world war relic, mustard gas, probably a leftover from the 1980s. Here, MacKenzie examines the chemical horrors in the world history and the future
