This document discusses water usage and sustainability. It defines key terms like water footprint, virtual water, and water neutrality. The water footprint measures the total freshwater used directly and indirectly to produce goods and services. Virtual water refers to the volume of water needed to produce a commodity. The document provides examples of the large water footprint of everyday items like a hamburger and cotton t-shirt. It raises questions about considering total environmental footprint instead of individual components, the potential impacts of water privatization and biofuels, and how consumer habits may change with increased scarcity.