3. Nitrogen fixation, 1918

The German chemist Fritz Haber, also the father of chemical weapons, won a Nobel Prize for his development of the ammonia-synthesis process, which was used to create a new class of fertilizers central to the green revolution 

http://www.theatlantic.com/magazine/archive/2013/11/innovations-list/309536/#sthash.OPO28ePN.dpuf

Rivera, Therenz