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Le Roy Ladurie has also worked on the history of French regions (Histoire de France des régions, 2004) and on anthropometric history as well as on the impact of climate changes on human history. Besides writing books, Le Roy Ladurie is a prolific essayist writing on variety of subjects such as the utility of computers as method of historical research, rates of delinquency in the French Army in the 19th century, the spread of global diseases and the belief of French peasants that magic could be used to generate impotence. The latter was a reference to the widespread practice of French peasant men in the Middle Ages and the early modern period of paying witches to use their (supposed) magical powers to make their rivals in love go impotent. Le Roy Ladurie is also known as one of the first modern environmental historians because his work focused on human agency in environmental change, as well as environmental factors in human history.