Witches,Warlocks and Weather

http://www.ozclimatesense.com/2010/08/witcheswarlocks-and-weather.html

A paper by Emily Oster reports that in medieval times superstition blamed witches for weather disasters and crop failures - 
"Therefore it is reasonable to conclude that, just as easily as they raise hailstorms, so can they cause lightning and storms at sea; and so no doubt at all remains on these points." 

Sound familiar? The Pope of the day with the medieval version of the IPCC report!