(1/11) This term, I’ve taught a seminar @IslamicSt_UniFR called “Little Ice Ages and Mighty Microbes. What Environmental History Can Tell Us about the #MiddleEast”. These are some of the things that I’ve learned. A thread. #twitterstorians #environmentalhistory (2/11) The Arab invasion of #Iran led to a cotton boom – until the 11th century. Then a “big chill” made agriculture detract. Leading Sunni scholars moved elsewhere &bimportant madrasas closed. This helped to eventually convert Iran into Shi’i-majority lands in the 16th century.