It's all to do with chinampas. These raised fields built on artificial islands sound almost too good to be true. Often fed by a network of canals and dykes, they apparently afford "extremely high" ...

In Mexico City, a 700-year-old Aztec farming technique is giving a sustainable edge to modern agriculture. It was early on a Sunday morning, and I was in the Floating Gardens of Xochimilco, 28km south ...

At the height of their power, the Aztec Empire supported a population of up to 3 million in the Valley of Mexico, and many of their largest cities had populations exceeding 100,000. This was not easy, ...