According to UNICEF, 4 billion people already experience water scarcity at least one month per year. More than 2 billion live in countries where water supply is inadequate, and half the world’s population could be living in areas facing water scarcity as early as 2025, with global ramifications for public health and migration, not to mention peace. Our unequal world is divided not just by wealth or quality of life, but also by access to basic necessities like water. The Global Water FootprintAround the world, agriculture consumes 70% of all freshwater. Products can be ranked by their “water footprint,” which measures the number of liters of water used to produce one kilogram.