The document discusses the environmental conditions of the Kalahari Desert, which experiences extremely hot days over 100F and below freezing nights, with long periods of drought and rare thunderstorms. These conditions place limits on humans living there. The document also lists body systems most affected by the desert climate like circulatory, excretory, and respiratory and recommends loose clothing, boots, plenty of water, sunscreen, first aid kits, and other special equipment for surviving in the harsh desert environment.