Fritz Haber was brilliant. His discovery of the Haber-Bosch process to produce ammonia from the air was a miracle, allowing for the vast production of fertilizer which lead to our ability to feed the billions of people on our planet, rightfully earning Haber an Nobel Prize.
Yet, he also produced chlorine gas and conducted experiments that eventually lead to the development of pesticide gases such as Zyklon B, used to kill millions of Jewish people in Nazi concentration camps. I'm not sure where Haber would have fallen when his soul was weighed upon his passing from this Earth, but I know we couldn't feed as many as we feed without the Haber-Bosch process.
Today's SciShow video explains how the Haber-Bosch process produces carbon dioxide and some of the alternative processes that chemists are exploring that wouldn't produce carbon dioxide along the way.
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