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The Sahel, which separates Africa's Sahara from its savanna, is home to some of the continent's most vulnerable populations. These often nomadic communities live in vast desert territories, beset by terrorism, and trafficking in arms, drugs and people. To make matters worse, their often weak governments are struggling to deal with the effects of climate change. Now the world's biggest institutions are waking up, pledging billions of dollars of aid to promote resilience and regional infrastructure.But earlier this month the UN Secretary General Ban Ki Moon said he was still worried about insecurity in the region, and the emergence of a two-speed Africa.