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Humans have already assisted evolution through a century of nuclear power development, petrochemical consumption, and pharmaceutical misuse. No amount of genetic engineering can alter that.

The October 22, 2013 FRONTLINE special Hunting the Nightmare Bacteria makes it clear there is no turning back the clock; the age of antibiotics is coming to an end. Human misuse of antibiotics and the evolution of bacteria spell the collapse of public health in the 21st Century, and the eventual extinction of the human species. http://www.pbs.org/wgbh/frontline/film/hunting-the-nightmare-bacteria/