Mexico City is chronically short of water — an irony considering the Aztecs built the original city on a lake. Here & Now's Jeremy Hobson learns more about the region's acute water problems with Pedro Moctezuma of Agua Para Todos.

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An aerial view taken with a drone of "trajineras," traditional flat-bottomed river boats, at Xochimilco natural reserve in Mexico City on April 1, 2016. (Mario Vazquez/AFP/Getty Images)

An aerial view taken with a drone of "trajineras," traditional flat-bottomed river boats, at Xochimilco natural reserve in Mexico City on April 1, 2016. (Mario Vazquez/AFP/Getty Images)