Environmental changes have caused tensions between settled farmers and nomadic herders in Nigeria to flare into ethnic conflict.
But could working together to serve the demands of modern consumers heal ancient ethnic rifts, asks BBC World Service correspondent Stephanie Hegarty.
As the sun sets over the stony hills of Jos, long-horn cows climb awkwardly down into a rocky gorge. They shimmy their bony shoulders, navigating a path worn into the stone over decades of this same grazing ritual.
In this picture-postcard of serenity it's hard to imagine that until recently this community in central Nigeria was at war with itself.
It's one of the world's most ancient conflicts.
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