Water is the basis for the entire biosphere. Ponds, rivers, lakes, wetlands, and oceans are the habitat for myriad plants and animals and are a key component of the ecosystem. Groundwater is at once our main source of drinking water and a habitat. We use water for our food, daily hygiene, and recreational activities. Water also plays a key economic role as an energy source, transportation medium and raw material. Efficient protection and conservation of water resources are crucially important for biodiversity and sustainable use.