WAR AND FOOD, and “the dubious links between modern warfare and industrial agriculture… Haber threw himself into the German war effort, and his chemistry kept alive Germany’s hopes for victory, by allowing it to make bombs from synthetic nitrate. Later, Haber put his genius for chemistry to work developing poison gases—ammonia, then chlorine. (He subsequently developed Zyklon B, the gas used in Hitler’s concentration camps.)” He won the 1918 Nobel prize for chemistry for his work on making ammonia.”
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http://www.smithsonianmag.com/people-places/whats-eating-america-121229356/