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Explore: Africa's Rift Valley

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Reporter Tanya Datta visits the mountains of Ethiopia to investigate the booming trade in Khat - a narcotic leaf widely chewed in this part of the world.

Explore, a new travel-based journalism series, provides an insight into exotic parts of the world, revealing stories about the environment, globalisation, and politics. Africa's Rift Valley is on BBC Two at 2100 GMT, on Sunday, 1 February.

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