SELIBE-PHIKWE, BOTSWANA – Segwabe Morathi, a retired religious minister, works as a farmer in a village on the outskirts of Selibe-Phikwe, a small mining town in eastern Botswana. He says farming is not easy in Botswana, where a semiarid desert means that the weather is unpredictable. A changing climate has only made rain more unreliable, he says.