Mohammed Bah Abba designed an elegantly simple food storage device that is made up of two earthenware pots which utilize the principles of evaporation to create electric-free refrigeration. In between the two pots is a layer of fine, wet, river sand, and on top is a moist jute bag. When kept in a dry, well-ventilated, and shady location, water evaporates, cooling the inner container. As a result, Mohammed’s desert refrigerator allows produce to stay fresh for weeks, so less food is wasted, and farmers are able to increase their profits so that they can continue to provide for their communities. Mohammed sells around 30,000 coolers a year to farmers and other people who want to preserve food for their families and communities.