In this July 13, 2017 photo, chefs and restaurant employees walk through a vegetable garden on a floating farm known as a "chinampa" in Xochimilco, Mexico City. Xochimilco has also been a breadbasket for the Valley of Mexico since before the Aztec Empire, when farmers first created the “floating” islands bound to the shallow canal beds through layers of sediment and willow roots. (AP Photo/Marco Ugarte)
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