Water is essential for all life on Earth. It is necessary for hydration, temperature regulation, oxygen transfer, plant growth, and reproduction in humans, animals and plants. Nature provides water through the water cycle of evaporation, condensation and precipitation, but access to clean water varies greatly around the world. Many regions currently face or will soon face water shortages without changes to water management and conservation practices. Preserving access to clean, plentiful water is critical for ensuring public health, economic activity and protecting the environment upon which all life depends.