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In the town of Tonahuixtla, Puebla, Mexico, a native maize field sits below a tree-covered hillside. The town has been active in reforestation efforts to control erosion. (Photo: Denise Costich/CIMMYT)

In the town of Tonahuixtla, Puebla, Mexico, a native maize field sits below a tree-covered hillside. The town has been active in reforestation efforts to control erosion. (Photo: Denise Costich/CIMMYT)

In the town of Tonahuixtla, Puebla, Mexico, a native maize field sits below a tree-covered hillside. The town has been active in reforestation efforts to control erosion. (Photo: Denise Costich/CIMMYT)