The BlomCast looks at turning points in history, which have always fascinated me. My name is Philipp Blom, I am a historian and broadcaster and author of many books about the Enlightenment, the story of modernity and climate history. The climate catastrophe places us at the greatest historical turning point hin human history. What, if anything, can we learn from moments in the past in which a model of life seemed to change, or had to change, in which whole societies were transformed?