The document discusses issues around global water supply, demand, and scarcity. It focuses on the Ganges River in India and the Yangtze and Yellow Rivers in China as examples. Over 1 billion people worldwide lack access to clean drinking water due to factors like population growth, pollution, and diversion of water for agriculture. Rivers in populated regions of Asia and Africa are drying up due to water extraction and dams. Clean water availability will continue to be a major global challenge and affect economies going forward.