Since cannibalism is a completely normal response to severe stress, especially during times of famine and warfare, how much of a surprise would it be if the butchery of humans for food becomes commonplace in drought-ridden and overpopulated regions of the near-future Earth? According to sociologist Pitirim Sorokin, famine-related cannibalism occurred 11 times in Europe between 793 CE and 1317 CE, as well as in “ancient Egypt, ancient Greece and Rome, Persia, India, China and Japan.”

