In this July 13, 2017 photo, a farmer paddles his canoe to his floating farm known as a "chinampa," in Xochimilco, Mexico City. Xochimilco is designated by UNESCO as a World Heritage site. (AP Photo/Marco Ugarte)
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In this July 13, 2017 photo, a farmer paddles his canoe to his floating farm known as a "chinampa," in Xochimilco, Mexico City. Xochimilco is designated by UNESCO as a World Heritage site. (AP Photo/Marco Ugarte)
