Humans need clean water to live, yet millions of people in developing countries die every year from diseases associated with unsanitary water. One in five people lacks access to this basic resource, and experts fear that by 2025, a full third of the world’s population will be struggling to find potable water. Widespread pollution has contaminated many safe water sources, transforming them into festering(化膿する、腐る)pools of disease, yet water usage has continued to increase to record levels. Experts say that sanitation, purification, and water management initiatives are critical factors in the fight to bring clean water to the world’s poorest regions.