The world's climate isn't stable, but how can we understand climate change in the past? Dr. Alena Giesche is an expert on ancient climates, and she explains both how the field of paleoclimate studies works and its application to a massive issue: the fall of the Indus Valley Civilization, a topic on which she's spent years working. Patrick's book is now available! Get The Verge: Reformation, Renaissance, and Forty Years that Shook the World in hardcopy, ebook, or audiobook (read by Patrick) here: https://bit.ly/PWverge. And check out Patrick's new podcast The Pursuit of Dadliness! It’s all about “Dad Culture,” and Patrick will interview some fascinating guests about everything from tall wooden ships to smoked meats to comfortable sneakers to history, sports, culture, and politics. https://bit.ly/PWtPoD Listen to new episodes 1 week early, to exclusive seasons 1 and 2, and to all episodes ad free with Wondery+. Join Wondery+ for exclusives, binges, early access, and ad free listening. Available in the Wondery App https://wondery.app.link/tidesofhistory See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.