At least 9,000 years ago, humans began domesticating corn for the first time near Tehuacan, in the central Mexican state of Puebla, laying the foundation for permanent settlements in the Americas.
But in the past few years, more frequent and longer droughts have forced many farmers in the area to give up corn and other cereals in favor of alternatives requiring less water such as pistachio nuts or cactus.
Agricultural experts predict parts of Mexico will feel the effects of climate change more than many countries, not least because its location between two oceans . . .
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