20 thousands years living in arid conditions, high temperatures and low quantities of water in the desert of Kalahari have made evolve San people up to the point that they are able to live with only 250 cc of water a day.
Economic reasons, turistic activities and exploitation of an area of natural resources have motivated Botswana’s Government to persecute and drive out nomads san tribes from the desert.
In front of the negative of the tribes to leave their ancient lands, the Government destroyed their water reservations and keeps off the entrance of supplies to their lands, therefore the only water they can have in their areas becomes from the rain and the consequents small dams formed by it. The evaporation rate due to the high temperatures causes that the water reservations become minimum for their survivability.
Big international organizations, like Survival -which helps ancient tribes to defend their lives , protect their lands and decide their own future-, are collecting donations to search new methods of survivance in order to allow San Tribes to return to their original lands.