Climate Central: The air across the plain sizzles in the 95-degree heat, blurring the image of the huts in the distance. There's a 23-year-old Maasai warrior named Lekoko beside me and a group of 35 American tourists behind me. Despite having only spent three months learning English, Lekoko gives us a seamless tour of his boma, a circle of five clay huts surrounding a livestock pen.
He explains that the Maasai have lived in present-day Tanzania since the 15th century, and they have traditionally survived as pastoralists,...