SUKHBAATAR, Mongolia (AP) — The moon glowed in the predawn Mongolia sky as Agvaantogtokh and his family prepared for another big move. On horseback, he rode to a well with nearly a thousand sheep and goats. Occasionally, he and his wife, Nurmaa, stopped to help struggling young ones, weak after a harsh winter.

Thousands of miles away in Amadou Altine Ndiaye’s family led livestock through a sparse African savannah. Horses and donkeys pulled a four-cart caravan along dirt paths in sweltering heat. Cattle followed. The family believed the next village would be richer with vegetation.

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