‘Water Footprinting’ to Deal With Demand for Supplies

A water-use report issued in September by Coca-Cola with the Nature Conservancy found that 518 liters of freshwater are required to produce just one liter of its Minute Maid orange juice, and 35 liters are needed to produce a half liter of Coca-Cola. A growing awareness of just how much water it takes to produce everyday consumer goods is inspiring a rising interest in “water footprinting” — akin to carbon footprinting — as a tool to analyze and guide the development of new technologies, water infrastructure investment and policies aimed at coping with the world’s rising water demand. Conceptually, the water footprint is similar to that of carbon — an impact indicator based on the total volume of direct and indirect freshwater used in producing a good or service. There is a difference, however. Unlike carbon in the atmosphere, fresh water resources are localized, not global. The volume of water needed to produce a carton of orange juice or a bottle of Coca-Cola, for example, may be fixed; but the actual effect on a freshwater resource, and the local environment, can vary tremendously — including the amount of energy and raw materials used and the chemical and other waste contaminants created in the process...more