Up to a billion people live in the dry-lands of the developing world. They are invariably among the world's poorest, and many belong to some of the world's oldest cultures, struggling to come to terms with modernity. These include the Maasai of Kenya, the Chorfa communities of Morocco, and the Topnaars of the Namib Desert.
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Some dryland residents are among the world's most isolated people, such as those who live in Pakistan's Thar Desert, or inhabitants ...