Water-saving faucet / faucet product

DROUGHT is big issue to all. water shortage connects to war in some places. To provide water for shortages, it needs 92.4 billion $ ~148 billion $ per year. The shortage comes from overuse of water like turning on faucet even though we are not using all the amount. Then, what can we do to save water? With using WATER-SAVING FAUCET, by giving affordance of auto controlling quantity of water, people will realize how they can save water in their practical life.