A man battles a sandstorm as he guides his herd of donkeys across an open expanse in Chinguetti. The Sahara is reportedly expanding southward at a rate of 30 miles per year, creating an existential threat to the tiny 260-acre settlement of Chinguetti. UNESCO, who has designated the village a World Heritage Site, warns that the seasonal flash flooding and frequent sandstorms caused by global climate change are creating devastating levels of erosion, exacerbating the threat.