The American southwest is in a megadrought. Water levels in lakes are dropping, threatening the local environment as well as agriculture, hydroelectric power, and the people living there. As global temperatures rise, it could be a preview of worse things to come. 

Guest: Dr. Jason Smerdon, ocean and climate physicist, and Lamont research professor at the Lamont-Doherty Earth Observatory of Columbia University and co-director at the Earth Institute Faculty. 

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