In rural Tanzania, murders of elderly women accused of witchcraft are a very common form of homicide. And when Tanzania suffers unusual rainfall — either drought or flooding — witch-killings double, according to research by Edward Miguel, an economist at the University of California, Berkeley.
“In bad years, the killings explode,” Professor Miguel said. He believes that if climate change causes more drought years in Tanzania, the result will be more elderly women executed there and in other poor countries that still commonly attack supposed witches.
New York Times, 13 Apr 2008